Premier Diet Keto: This sure surprised you. I used to spend ages doing crunches thinking it was helping. Crunches, sit-ups, as well usual ab exercises (including ab machines) are not the fastest way of obtaining a flat belly. Don't forget your stomach is a muscle just like any other muscle in the human body. You don't do squats in 50+ rep sets for your legs, so don't do 50+ rep sets of sit-ups on your own abs.
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