Crunches are much more effective than regular sit-ups because they specifically target your upper abdominal muscles rather than your hip muscles. If you're not used to them, they can cause soreness a day or two later, but it's a 'cool' soreness. A badge of honor. (Sylvester Stallone)

Crunches are much more effective than regular sit-ups because they specifically target your upper abdominal muscles rather than your hip muscles. If you're not used to them, they can cause soreness a day or two later, but it's a 'cool' soreness. A badge of honor.

Sylvester Stallone

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abdominal badge cause cool day effective hip honor later regular soreness target upper

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