App Features：
1、Progress tracking: The app has an in-app tracking system that allows you to track your weight, reps, personal records, and everything related to your workout progress. Each 90-day program also includes monthly strength tests to see your progress each month. Additionally, there are fun weekly challenges to keep you active and help you see yourself getting stronger over time.
2、Before and after photos: You can take progress pictures with the in-app progress picture tool, and create your own personalized "Before and After" images to share with others. Besides visual changes, you can track your weight and see your weight changing over time.
3、Calorie calculator: The 90 Day Challenge app also includes an in-app calorie calculator that enables you to calculate your calorie needs for losing weight, mAintaining weight, or gaining weight. You can also determine your macronutrient split and set your own diet goals.
App Highlights：
1、Unlimited program options: The app has unlimited 90-day program options for all your goals. You can choose to work out at home, in a gym, or in a park. You can also choose from beginner to advanced levels, regardless of whether you have zero experience or years of training.
2、Healthy recipes: Within the app, there are healthy and delicious recipes that will help you to build muscle and lose fat. These recipes are explained in great detail, including the ingredient list and the cooking instructions.
3、Challenge others: The app has a built-in feature where you can challenge others to join the exact program that you have. This way, you can work out together and keep each other accountable to keep hitting your workouts.