Lose weight, gain muscle, show your perfect abdominal muscles, and have healthier cardiopulmonary function. Just begin with 18 sit-ups a day. ## How to use App? Keep this position with both hands, hold the phone, and place the phone on the chest.
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Daily SitUp Workout
Lose weight, gain muscle, show your perfect abdominal muscles, and have healthier cardiopulmonary function.
Just begin with 18 sit-ups a day.
## How to use App?
Keep this position with both hands, hold the phone, and place the phone on the chest.
