Count your push - ups, sit - ups and squats. Create own challenges and adjust to your actual abilities. You can set time limit of your training.
All repetitions will be saved in your profile even if you do not finish training in required time. It will motivate to do some more. Watch your statistics from day, week, month and all time. Different colors show your level. How best can you achieve?
Get strength and beauty with Basic Workout app.
Good luck!