Very good
Ive been using this app for two months. Its really good. My arms are getting stronger, and my wife notices my body shape changes. My arms are inherently weak and Ive never done this many push-ups in my life and expect to do more since I am only half way through. The app is very clean, and the colorful interfaces and the trainer voice are highly motivating. Sometimes, the difficulty increase between the steps is too hard, then I do as much as I can and just end the session, and re-do it in a few days -- then most of the time I get the second level.
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PushUps for Beginners - 0 to 100+ Pushups Training