How to Create a Fitness App: Codica's Expertise

The downloads of fitness apps reach millions worldwide. People enjoy using health apps to track their heart rate, the quality of sleep, or the number of calories consumed. Fitness applications also gained popularity as people got personalized workouts at home without needing to go to a gym.

Knowing what aspects of fitness apps are valuable for people, you can build yours. With this app and relevant business efforts, chances are you can get your market share in this vast sector.

In this article, we discuss how to create a fitness app and our team’s experience in successfully developing one for Impact Personal Training in Luton, United Kingdom.

Fitness app market: overview

As people become more aware of wellness and health, fitness apps experience a surge in downloads. Serving as fitness trackers, personal trainers, dietitians, and therapists, these apps help users stay fit. Such positive trends drive the fitness app market. As reports show, the fitness application segment undergoes the following changes:

• Leading fitness apps saw 25.15 million downloads as of January 2025, according to Statista;
• North America led the global fitness app sector in 2024 and yielded the largest revenue share of 39.93%;
• The compound annual growth rate (CAGR) in 2025-2033 is expected to be 13.59%, with a market volume of $33.58 billion by 2033;
• Exercise and weight loss apps held the largest market share in 2024;
• Canada is expected to gain the fastest growth during the forecast period.

Source: Statista

Top fitness apps

MyFitnessPal: Calorie Counter

As the app states, fitness starts from what you eat. So, it comprises both sides of keeping fit - activities and nutrition. You can set weight, workout, and food consumption goals and track your progress. Users also can choose personal plans or those offered in the app.

Furthermore, the app includes a food scanning feature. You can scan a product you are eating and see the number of calories it has. The app allows scanning barcodes on the food packages as well.

Source: MyFitnessPal: Calorie Counter

Zing AI: Home & Gym Workouts

This fitness app has advanced features based on AI. The app offers a diversity of workouts, such as strength, HIIT, stretching, and recovery. Thanks to AI, you get personalized workout plans based on your body data, fitness background, and goals.

The key features include a personal AI coach, body scan, and tracking progress. These features help you get personal workouts based on your mood, energy levels, and previous progress.

Google Fit: Activity Tracking

In this app, you can set goals for heart points and steps. You receive 1 point for a moderate activity like walking and 2 points for running. This fitness app tracks speed, pace, route, and other parameters when you exercise or ride a bike.

Peloton: Fitness & Workouts

This app is packed with thousands of workouts. You can choose different exercises, like strength training, indoor and outdoor, HIIT, yoga, stretching, walking, running, and much more.

The solution allows you to personalize your experience with recommendations from top instructors. You also can choose your workout goals, schedule classes, and select pleasant and driving bits for training.

Fitbit: Health & Fitness

Fitbit stands out among activity tracking apps. Users can check calories burned and active time. Also, the app allows you to track workout progress, heart rate, and sleep time. In addition, users can compare their physical activity stats with nutrition to see their progress. Moreover, the app enables you to share the results on social media.

Strava

This is one of the top activity tracking apps. It can be used while walking, running, riding a bicycle, or swimming. The app allows you to track the distance you have passed by adjusting your GPS. This fitness app shows the progress made over a week or a suggested time range. You can also compare your achievements to those of other users.

Source: Strava

Muscle Booster

This is one of the workout apps offering individual muscle gain programs. It includes more than 1000 workouts. You can get a personalized program and follow your plan.

Also, you can select the body zones you want to work on. The options available in this workout plan app include shoulders, chest, arms, back, belly, and legs. Each workout is divided into rounds, with the possibility of repeating exercises.

Home Workout - No Equipment

The workout app offers daily workouts for all muscle groups. The exercises do not require equipment and are performed just with body weight. Experts designed the exercises for different muscle groups. Each exercise has video guidance and animations for correct performance. The app is the leader among health and fitness apps in the Google Play Store by downloads.

How you can make money with a fitness app

Fitness applications can bring their owners millions of revenue. In January 2025, MyFitnessPal was the top-ranking app, bringing $16.1 million in profit.

Source: Statista

So, how can you get income from your app? There are several ways to make your app profitable. Let’s go through them.

Paid apps. Before accessing the app, users should pay for it. The price of an app is formed by its features and content it offers. The mobile iOS or Android platform of the workout app also affects its cost. iOS apps are more expensive. Therefore, the price of paid apps will vary respectively.

In-app advertisements. If you distribute your fitness application for free, you can suggest users buy items with your app. The offer includes a personal nutrition plan or healthy diet recipes based on users’ preferences and habits.

In-app purchases. This model implies that you offer your workout app partially for free. After gaining enough audience, you can provide premium experiences as in-app purchases. For example, in-app purchases may include personal coaching services or an add-free subscription.

Ads. Your app can bring profit if you cooperate with other fitness- or sports-related companies. Typically, the fitness application includes a cost-per-click or cost-per-mille commission. Also, you may include the ads of rewarded videos and rewarded surveys that give users points for certain activities.

Sponsored content. You can partner with fitness professionals and share their content in your app. Thus, users will gain expert information and advice on fitness through your solution.

Basic features in fitness applications

There are three main types of information that fitness apps show:

• Activity tracking;
• Diet and nutrition;
• Workouts and exercises.

Based on these aspects, you can plan functionality for your solution. Let’s discuss in more detail what features are helpful to have in your fitness and workout app.

User profile

A user profile in workout apps typically includes the parameters that help personalize training. Users enter their body measures and age, activity level, and other parameters. This feature should also enable your users to enter the following data:

• Weight goal;
• Workout goal;
• Nutrition preferences;
• Progress dashboards.

For example, BetterMe, one of the top fitness apps, provides a changeable user profile with essential data for outlining your program. You can edit your profile settings at any time. So, you always get the fitness plan that fits your current physical and daily life parameters.

Workout catalog

This is the core of any fitness app. You can deliver exercise videos, both live streaming, and available online on-demand. Also, you can include exercise images with voice explanations.

Since everyone has a different level of physical activity, the workout plans should correspond to them. So, it is advisable to include workouts starting with low and up to high impact. When you make a fitness app, provide your users with the ability to adjust, schedule, and plan workouts.

It is helpful for your users if you create a fitness app with the following points for this feature:

• Time, equipment, and description for each exercise;
• Easy switching between exercises;
• Text-to-speech tool for voice tips with the support of many languages, like Google’s text-to-speech integration;
• Workouts calendar or schedule dashboard.

Maps with routes and geolocation

This is a necessary feature for the apps that track the users’ activities during running, cycling, or swimming. They can use it while the activity is in progress or after it is completed. It is helpful to include the following aspects in the routes when you create a fitness app:

• Highlighting the points of the route that the user passed;
• Point to the efficiency of the workout;
• Providing data on the speed of movement and calories burned;
• Weather forecast and air quality integrations.

Notifications

You can help users apply the fitness solution more efficiently by sending notifications. They remind users of the workouts they need to do today or diet and nutrition plan. Also, you can notify users of the results they achieved today.

Notifications should encourage users to stay with the app. So, it is helpful to use motivational quotes, positive messages, and other elements of gamification when making a fitness app. They will inspire users to train with the app more. For example, the Six Pack in 30 Days app congratulates users on the finished workout.

Consider the following aspects for notifications in the fitness application development:

• Notifications should be prompt and concise;
• Include a log of notifications allowing users to keep track of their activities;
• Enable users to manage and personalize notifications.

Nutrition plans and calorie counting

Nutrition is a vital part when it comes to keeping fit. The top applications offer calorie counters and meal plans to watch diet and nutrition. They also offer recipes based on the users’ fitness goals and preferences.

The nutrition planner enhances users’ experience by including the following options when you build a fitness app:

• Bar code and food scanning allowing an instant count of calories;
• Dynamic adjustment of recommended meals based on calories consumed and burned;
• Tracking water intake.

Integration with audio streaming services

People like doing exercise or running to their favorite bits. Provide users with a smooth choice of songs. For this, you can integrate the solution with music streaming platforms, such as Apple Music, YouTube Music, or Spotify.

When you make a fitness app and add integration with the music service, the following is advisable:

• Offer users the feature of creating and sharing playlists;
• Let users choose the pieces that fit their workout tempo;
• Bring up the tracks that helped users achieve better results.

Integration with educational materials

Educational content may include tips on diets and healthy lifestyle. Users can pick valuable recommendations that they can fit into their workout routine.

To make your users happy, consider the following aspects of fitness app development:

• The content should relate to your users’ interests;
• Offer concise audio, video, or blog pieces;
• Customize the offered content to the users’ fitness results.

Including a content management system (CMS) that conveniently displays the materials in your app is also helpful.

Integration with wearable devices

Workout app development also includes integration with smart devices that give valuable statistics. These include smart watches, fitness trackers, and heart rate monitors. Such wearables help users see their results and keep track of their progress.

Leaderboards and social media sharing

Leaderboards and sharing their results on social media motivate people to achieve more. This is also how they can spread the word about your application. So, it is advisable to include these features when developing a fitness app.

You may also like: Choosing a PWA Development Company: Key Points to Consider

AI-powered features for a fitness app

In addition to basic features, you can add AI features to make your app more personalized. They include the following:

• Personalized workout plans. AI can provide individual workouts based on fitness experience, age, weight, and personal goals.
• Smart activity tracking. With AI technology, you can help users track their activity and get relevant insights.
• Virtual fitness coach. The feature of the virtual workout assistant helps you track your movements and get relevant suggestions with dynamic exercise adjustments during workouts.
• Predictive fitness analytics for progress tracking. AI fitness technology analyzes previous performance based on past workouts and health data. Thus, you can set realistic goals and milestones.
• Injury prevention and recovery guidance. AI can analyze pattern data and detect potential overuse or improper form. It can also provide dynamic exercise recommendations and rehab plans for recovery.
• Integration with wearables and IoT devices. You can connect your fitness app with other devices to help users track their heart rate and other parameters and reflect them on a dashboard.

Overview of the Impact fitness application by Codica

How it started

Impact Personal Training is a fitness gym based in Luton, United Kingdom. The facility gathered professionals who create personal exercise and nutrition programs for clients. The gym aims to create an atmosphere that helps clients move at their own pace while reaching tangible fitness results.

During the COVID-19 pandemic, Impact’s clients were unable to attend the gym. So, the center decided to offer their clients a fitness app with the opportunity to stay fit while being at home. The app remains helpful now, providing personalized fitness programs and progress tracking whenever and wherever people need it.

Impact fitness app stats

The Impact fitness app includes 400+ exercises and 2000+ performed workouts. 400+ users downloaded this app on their mobile devices and desktops.

Solution delivered

Codica created the fitness app from scratch as an MVP (minimum viable product) with basic features. As the trainers and clients used the app, they started providing feedback to the Impact company on the desirable features.

Based on our expertise, we improved the app features in response to users’ recommendations. As the app had more features added, we also optimized it to reduce server loads.

Web and mobile app

At Codica, one of the approaches we choose to develop apps is as PWA (progressive web apps). There are several reasons for that. Let’s see what they are.

A PWA is a solution that provides a full experience, similar to native apps, but with added convenience for users. The PWA can be accessed from both desktops and mobile devices, offering the same rich features. Also, users don’t need to install the PWA, as they can access it directly from the browser.

For example, one of our customers needed an app that helps cyclists get insurance. We created a lightweight and secure insurance progressive web app. It allows users to report an accident from their smartphones. Also, the app enables you to receive insurance policies and payments.

As we know the peculiar aspects of progressive web apps development services, we were also ready to help Impact Personal Training. The initial need of Impact was to make a fitness app for desktops and mobile devices. That was because the Impact trainers prefer desktops, and their clients opt for mobile devices to use the app.

So, we decided to develop the Impact fitness app as a PWA. Thanks to its cross-platform nature, the Impact PWA is well-adapted for both desktop and mobile devices.

Below you can watch a brief video that shows how this app works.

Read also: Breaking Down the Cost of PWA Development: Insights and Best Practices

Impact fitness app features

Features for clients

Exercises for personal fitness programs

Fitness apps should include a variety of exercises with detailed descriptions of the techniques involved. For better results, include videos with comments on how to do exercises properly.

We included a convenient menu with exercises in the Impact fitness app per client’s requirements. It shows the number of sets, reps, and tempo for exercises. Each exercise includes a detailed description and a video demonstrating the correct technique.

Training management

Clients can view their fitness programs in the app in an organized and convenient way. All their exercises and nutrition details are displayed via a handy dashboard that shows the training scale, today’s workout plan, and progress.

Clients can mark exercises as completed, allowing them to track their daily achievements and overall progress.

Nutrition programs

Along with individual exercises, clients get personal nutrition programs. The app includes features that enable clients to tick the food eaten on their plan. Also, a user enters the data on the off-plan consumption if there was any.

The nutrition program shows meals and supplements. Also, it reflects nutritional components, such as protein, fat, and carbs.

Metrics and metric-based charts

As clients follow personal programs, it is convenient to see a graphic presentation of their progress. So, we included metrics in the health PWA. They represent the clients’ progress over the time of training and relative to the goals set by trainers.

Features for trainers

Training management

We developed a useful dashboard for trainers, so that they can compose personal programs for clients. The dashboard allows selecting clients from the list and choosing the most suitable exercises for them. Trainers can add several exercises or several sets to one exercise.

Nutrition programs management

The app management system allows trainers to assign and change the nutrition plan for clients. The system includes features that help trainers keep track of clients’ progress.

Product discovery sessions

The product discovery is a step when you discuss your project with the workout app development team. At this stage, you describe the general idea of your fitness application to the team. In such a discussion, the team gets answers to a set of questions, including the following ones:

• What are the business objectives of developing a fitness app?
• What is the target audience that will use the workout app?
• What are the competitor apps?
• What is the project’s timeframe?
• What is the budget for creating a fitness application?

Below is a short video that helps you learn more about the product discovery stage in web app development.

Based on the product discovery outcomes, the team plans how to create a fitness app. In particular, as our team plans your project’s development during product discovery, you get documentation and recommendations on your solution’s design, architecture, cost, timeline, and team composition.

Below, we describe the product discovery outcomes for the Impact fitness app.

Business logic and specification

The Impact fitness app is designed to provide comprehensive support for trainers and their clients. It helps clients stay fit and healthy by following the programs set by their trainers when the gym is unavailable. The whole logic of the app revolves around this concept, and features were designed to help trainers and clients achieve their goals.

Hence, in accordance with our client’s requirements, we packed the solution with necessary exercises, menus, and dashboards to help trainers bring fitness to their clients, who can follow programs with the handy features in the app.

Prototype development

Prototypes are drafts representing the flow and structure of the app. They are necessary to show the arrangement of the app’s menus, fields, and buttons. As prototypes can be clickable, you can see how your app will work during the fitness app development. For example, below is a program menu prototype of the Impact fitness app.

Prototypes are helpful as they simulate user interaction. Also, you can test them with users and make changes if necessary. Prototypes require less effort for development. So, making adjustments at this stage will be cheaper when you create a fitness app than full-scale development.

We developed the app prototypes in collaboration with Impact Personal Training. Trainers prefer desktops to assign tasks. Meanwhile, clients usually use mobile devices to track their fitness progress. With our UI/UX design services, we created UX prototypes for desktop and mobile versions of the solution.

Technologies used at Codica to build a fitness app

Our team has vast experience in building PWA. That’s why we offered Impact Personal Training the technology stack that ensures the app's stable work. It includes the following technologies:

• React. This JavaScript framework allows for flexibility when making changes to the app. It helps build a robust and responsive PWA.
• Ruby on Rails. We like Ruby on Rails for its versatility and use it to create the proper backend logic for an app.
• Sidekiq. It is used to run tasks in the background in a Ruby app.
• PostgreSQL is a stable and reliable database available for free access.
• Amazon Web Services is a cloud service resource that provides hosting for an app.

We also used integrations for the Impact app:

• Dropbox for uploading and sharing images;
• GitLab for monitoring the app work and security;
• Sentry for checking the errors that users encounter while using the app.

Related reading: How to Make a React Progressive Web Application (PWA)

5 steps when developing a fitness app: Codica’s practice

When it comes to fitness app development, we recommend going through a particular development process. It ensures that the app you create fits users’ needs and will be in demand. Let’s see what such steps are and how they help deliver a high-quality workout app.

Step 1. Project infrastructure setup and DevOps

Development starts from the correct setup. In this regard, our DevOps engineers choose the best tools and practices to ensure the development process is optimized and cost-effective.

That is why our DevOps team analyzes the project’s requirements before building the right environment for the development process. Then, they adjust the processes with central control and modular approach to ensure cost-effectivess, transparency, and easy scalability.

Step 2. UI/UX design

UI/UX design is a vital part of your fitness app. The graphic side creates the first impression for your users. Thus, UI design can determine whether users will enjoy your app and whether they will continue using it in the long run.

As the Impact app is packed with meal and calorie tracking, exercises, videos, and progress tracking, we carefully outlined those features in the design. While desktop screens allow for a spacious arrangement of buttons and menus, mobile screens impose size constraints. So, dropdown menus are king in the mobile version of the app.

Moreover, for the Impact app palette, we selected a dark theme that resembles the design of the Impact sports gym and is associated with a sense of focus. The design part also includes the look of UI elements, such as colors, fonts, and icons, which contrast against the main dark theme with lighter hues.

You may also like: Progressive Web App Design: 9 Tips for Great PWA UX and UI

Step 3. Fitness app MVP development

We recommend that our customers start the development process by creating a minimum viable product (MVP) first. There is a range of advantages to MVP app development services. In this version, the product holds basic features. So, it requires less effort for development and can be launched in the market earlier. Thus, you save time and money when building a fitness application.

MVP is a workable presentation of a product. So you can see how people use your product and what they would like to improve. Furthermore, testing the MVP in use shows potential investors whether your product will be in demand.

Our team uses JavaScript, Ruby on Rails, and frameworks to cover the frontend and backend. Also, we include third-party integrations to ensure that the app is stable and secure.

We apply the best project management practices. Such an approach improves the team’s communication with a customer. Furthermore, it helps our project managers to optimize the development team’s work. The result of the joint work is a convenient and user-friendly product.

Developing a product, we move in iterations. This allows the development team and customer to see that the app development is moving in the right direction. If needed, the customer and the team can make the necessary changes at any stage.

Step 4. Quality assurance and optimization

After the product has been developed, we check and refine it to deliver the best result. That is why we thoroughly test the solution to make it work correctly.

Also, we perform code reviews and refactoring. This allows us to speed up and stabilize the solution work. Thus, we ensure the app runs smoothly.

Step 5. Support and maintenance

After the fitness app development, the team provides the customer with support and maintenance of the solution. This ensures that the workout app runs properly with different devices and operating systems.

At Codica, we use these stages in our mobile app development process. So, our customers receive tailored solutions that their users enjoy.

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How much does it cost to create a fitness app?

There are different types of fitness apps that vary in purposes and features. Therefore, the apps differ in complexity and cost for their development.

Below, we prepared a table showing an approximate time and cost for the app development process and particular features.

Therefore, the approximate cost of creating a fitness app is $66,400. The exact cost of the fitness application development depends on the features and rates of your development company.

Need to build a fitness app?

Our experts are eager to help you.

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To sum up

Building a fitness app is challenging regarding the variety in this market sector. Still, it is worth the effort. People enjoy tracking their activities and sharing their fitness achievements with friends.

Your fitness app should embrace all the necessary features that help users track their progress. Include the streaming and educational integrations that will motivate your users. Also, think of the convenience of your app, such as switching between exercises or choosing the workout music.

Such an approach will help you in fitness app development and meeting people’s needs.

Check out our portfolio to see how the fitness PWA for Impact works. If you want to create your workout or fitness application and you hesitate about where to start, contact us. Our mobile app development experts are ready to help you build a fitness app that your users will enjoy.