training routine for getting better at sit-ups?

[orange;katy]

i am training for a competition with an out of school activity and have been chosen to enter in the fitness part of it.this means i have to do as many sit ups as i can in a certain amount of time!at the moment i can hardly do any!what is the best workout scheme i can do without overdoing it?

[SmarterThanU]

I motivate myself by hanging a juicy cooked pot roat from the ceiling, and everytime I come up from doing a sit up I take a bite. Mmmmmmmmmm

[quattro]

The best workout is to actually do the sit ups .Make sure you warm up properly and do some stretches first then get on the floor and do the sit ups you don't have to do the full sit ups first just raise your shoulders as far off the ground as you can see how many you can manage then rest then do some more until youve had enough.The next time you come to do it try to beat your first score after a week or so when you have got used to it set yourself a reasonable target to beat and push yourself until you beat it.