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If a flat belly is your goal, situps may not be your best bet. By Yuri Elkaim, Contributor | Feb. 21, 2014, at 9:12 a.m. I am often asked if doing situps or crunches will get people the toned six-pack abs they're looking for. Unfortunately, even if you do 100 crunches a day, you won't lose the fat from your belly. Not a chance. And since a toned belly is exactly what everyone is looking for, the market is saturated with all kinds of belly-busting contraptions and workout DVDs.
Restricting your calories and breaking a sweat with exercise will help you reach your caloric deficit. It takes 3,500 calories to melt off a pound of fat. Therefore, you must burn 500 calories a day to reach a weekly weight loss of 1 lb. Simply doing 20 crunches will burn less than 20 calories.