Sit-up: Lie on your back with feet on the floor and knees bent. Put your hands behind your ears. Without pulling on your neck and using only your abs, lift your shoulders off the mat and come to a ...

Unless you’ve been living under a rock for the last five years, you’ve probably heard about the plank — one of the all-time best exercises for strengthening and toning the core. But let’s get real — ...

Planks are the MacGyver of bodyweight movements: They’re super tough and great for almost any situation. The versatile move is best known for working your core, but planks also engage more than 20 ...