Question: How Often Should I Do Abdominal Exercises?
Crunch on an Exercise Ball
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Answer: No research to date has found any benefit from doing abdominal exercises more than 3-5 times per week, however, it's not harmful to work your abs everyday. It's difficult to fatigue or overwork the abs by performing standard body weight exercises due to the limited resistance through a small range of motion. If you work your abs with resistance, you should allow a day of rest between workouts.