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 question ...

We’ve all done it. Stared down at our stomach, groaned, and dropped to the floor to bang out a set of sit-ups—hoping, maybe praying, that each crunch would somehow melt away belly fat. It’s ...