The 21-day challenge: Pick 5 days per week to do an ab workout. Take two days off each week, for a total of 15 ab workouts in 21 days. You can do these routines after a workout or as a stand-alone workout.
The 21-day challenge: Pick 5 days per week to do an ab workout. Take two days off each week, for a total of 15 ab workouts in 21 days. You can do these routines after a workout or as a stand-alone workout.
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