Crunches and situps can be great core exercises to tone the abs when performed correctly. Learn how to do a crunch the right ...

Lay on a flat surface with your legs out ... sit-up but with a smaller range of motion. During a crunch, only your shoulders come off the ground, and your lower back stays down.

Place the forearms on the ground with the elbows aligned below the shoulders, and arms parallel to the body at about shoulder-width distance. If flat palms bother your wrists, clasp your hands ...

lift them into the air and crunch up as usual – keeping the back firmly on the ground. Again, lie on your back with knees bent and feet flat on the floor. Roll your knees to one side down on the ...

Crunches have had their moment, but it's time to take your core training to the next level. Your abs aren't just show muscles ...

But crunches target just one of those muscle ... Sit down with your knees bent and feet flat on the ground. Lean back slightly, engaging the core and keeping the back straight.