To burn 400 calories through situps alone I'd guess you'd need to keep at it for 45-60 minutes, assuming you can keep doing them at a steady pace all that time. Me, I'd go for a run instead.
If you do sit ups every day for a while, you may lose weight. However, you will tone your abs and stomach muscles but not have much weight loss. Sit ups don't get your cardio function up.
no because they have too much fat on them to even sit up.
grown ups 400-700kg
50000000000
Sit ups do not burn stomach fat. Sit ups build and tone stomach muscles.
Twice a day, do sit-ups for three minutes. Overtime, you'll get better. I can do about 65 sit-ups per minute.
sit-ups raise your heart beat more
The number of sit-ups that you need to do to lose two inches depends on many factors. The first is how much you weigh when you begin. The second is how long it takes to do those sit-ups. The faster you do them, the more calories you burn. Doing 100 sit-ups in 10 minutes will burn approximately 57 calories.
sit ups measure your stomach strength.
push ups sit ups run and all the other sports that children do
at the last smackdown vs raw sit up/ push up contest john cena, (raw) did 112 push ups and 116 sit ups. he came second to batista (smackdown) who did 117 push ups and 119 sit ups
It would be practically impossible to lose weight just with exercise alone. An average person weighing 145 lbs. would need to perform a total of 17,500 sit-ups in order to burn a pound of fat which is equivalent to 3500 calories. This is why doctors recommend combining diet and exercise.