When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images Bored of planks and crunches? Why not try mixing things up with a killer ab ...

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 ...

Sit-ups have seemingly been a staple in our training programmes since time began. Despite their omnipresence, they are perhaps one of the most hated exercises to grace our Google searches, aside from ...