Cable Crunch
The Cable Crunch is an effective core workout typically performed at the gym. To do this, kneel under a high pulley containing a rope attachment. Grasp the cable rope attachment and lower the rope until your hands are next to your face. Flex your hips slightly and maintain this position. While keeping your hips stationary, flex your waist as you contract your abs, allowing your elbows to move towards your thighs. Return and repeat.