The 21-day plank app for men and women is designed to strengthen and train the abs, core muscles, as well as burning belly fat and losing weight. Exercise plank is the best exercise for the abdominals, and with our app the plank for 21 days, you can train your abs muscles and reduce weight. If you want to train your abs at home - then this plank counter will be one of the best, as it is suitable for home fitness workouts. You can also use the exercise bar for weight loss and for weight loss.