Our core is made up of four muscle groups that are essential to everyday movements, like walking and lifting. And when people think about core strengthening, crunches are often the first thing that ...

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 ...

Whilst almost anyone can do a crunch or a sit-up, for most of us the higher reps remain the preserve of avid gym-goers, Olympians and celebrities. However, in reality, physiologists and personal ...