PUSH Workout Build Muscle is a lifestyle app designed to help users build muscle as quickly as possible using scientific principles. The app features an AI system that utilizes published research to generate personalized workout programs based on factors such as experience, sleep, gender, stress, and available training time. Users can tap on referenced articles throughout the app to learn more about the scientific basis behind the program.

The app fine-tunes the volume, frequency, rep range, and exercise selection based on the user's data and scientific research. PUSH also incorporates periodization and progression into the program, providing actionable insights and daily undulating periodization systems. If users don't prefer a particular exercise, PUSH suggests alternative exercises based on fatigue and resistance curve.

PUSH aims to optimize gym workouts by making weightlifting routines as efficient as possible. It offers a smart exercise planner that schedules weightlifting exercises on a better schedule compared to common 5x5 routines. The app integrates with HealthKit to save workouts and track metabolic rates and bodyweight.

Access to PUSH requires a monthly or annual subscription, with a free trial period for new users. Subscriptions renew automatically unless canceled, and payment is charged to the user's iTunes account. Privacy policy and terms of use can be found on the developer's website, and support is available via email.