If you've ever wondered (mid-crunch, most likely) exactly how many sit ups you should be doing every day to optimise your fitness, then you're in the right place - this is exactly the type of ...

Set Core Plan that builds strength & definition faster than 100 sit-ups a day. Efficient, science-backed core training awaits ...

Take a 30-second break, and try it again. Its a lot to handle, so let Marthaler take you through proper sit-up technique: Keep that chest up, he says, abs tight, and slowly peel off and come up.

Ready to torch your obliques? I added this simple standing ab exercise to my routine for a week. Here’s how I got on.