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Challenge yourself and strengthen abdominal muscles in 30 days!The challenge includes a set of exercises which should be performed daily with a rest day every fourth day. Through the month he amount of repetitions will gradually increase.This app's clean and simple interface will allow you to focus on the exercise instead of navigation. Only one tap is needed to complete today's workout.Keep the daily workout plan near by setting it on one of the complications on your Apple Watch. Or add it to the glances.