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 ...

When was the last time you cranked out a set of sit-ups? Chances are, it was during elementary school P.E., probably while dreading the infamous Presidential Fitness Test. But don't let those memories ...

Sit-ups and crunches both target your core muscles, but work differently. You can use both exercises to build strength, endurance, and control.