situp is the least helpful exercise.
if you want to maximize your strength training effect use compound exercises that works the main muscles of the body.
As suggested by @jumowa do pushups, squat and I would add also pull-ups.
And if you want to strengthen your belly do the plank exercise and when it's getting easy for you, go for the extended plank variation (a better exercise than situp)
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Like I said to @jumowa I think im gonna just stick to the situp idea and then move on to pushups and squats after this challenge