Depends : 100 sit ups a day will strengthen your abdominal muscles in about 90-120 days. However, if you are asking about tone and definition of the "washboard stomach, " this is much more than sit-ups. This has more to do with diet than exercise. If you have belly fat, that needs to go away to achieve the "desired look.".
Answered 3/30/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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