We get it. You want lean body. And while no single exercise will ever flatten your belly or give you a six-pack (you need to adjust your diet for that), there are ways to work your abs even harder so that as you lose fat, you uncover a hard body. We asked Jim Smith, C.S.C.S, a strength coach at Diesel Strength & Conditioning, to identify the hardest core exercises. Try these and your abs will never look or feel the same.
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