By this app, it is no longer difficult to do 100 push-ups at once in 6 weeks. You can workout at home, at work, at school and at university. Also this app is free. What Muscles Do Pushups Work? *Chest muscles *Shoulders *Back of your arms *Abdominals You can easily improve your body in wherever you want, test yourself and start to push up workout. By this app, you can do without stopping 100 push-ups in 6 weeks . Everywhere and every day you can do workout for free. If you bored to pay gyms.