Sit-ups may seem like a basic and simple exercise. After all, to do this classic exercise, you just have to lie on your back with your knees bent and feet flat on the floor, raise your torso towards ...

Say goodbye to basic crunches and hello to three muscle-torching crunch variations to build core strength. For this workout, ...

Both sit-ups and crunches can help target your core muscles, but there are key differences between the two ab workouts.

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 ...

When most people think of core exercises, they think crunches and sit-ups – possibly because the tactical professions have used them for decades. But given recent changes in military testing, the next ...