Practice, become stronger!
The app is a "personal trainer". Use it once a day, for 20 days. On the 20th day you will do for 5 sets of more than 300 pushups. checked personally. Methodology approaches taken from a real coach.
As for prilozena, I strictly do not judge, because this is my first app. But criticism is ready to listen, to understand what is wrong.
Thanks in advance.