try doing lower back exercises. strengthening your back is just as important if not more than your abs. the stronger your back the less it will hurt when working out your abs. Also consult you doctor you may have someething wrong with your back that needs treatment.
i did 50 situps before i went to bed and in a week i had a six pack
He didn't do situps, silly!
pushups,situps,jumping jacks,toilets,squats,plugens.
maybe
situps in a decline position situps towards left and right side leg raises for lower abs
500 situps burn 100 calories so you need to do more than 2,500
Yes, 1cm.
situps
lower body parts
the muscles of the abdomen
i usually do bout 100 in a row but ive done 300 in a row before i usually do about 500-800 a day
lots of situps, and other ab work outs.