The crunch chop increases strength and endurance throughout the core. The exercise also actively engages the hips and glutes.
Lie flat on your back with arms extended above your head and fingers interlocked. Raise your legs straight up in the air. Your hips and torso should be at a 90-degree angle. This is your starting position.
Crunch upward, opening your legs into a straddle position. "Chop" your arms through your legs at the top of the movement. Pause, then return to starting position.
Make sure you go all the way back down. Do not cut the range of motion short.
Keep your core engaged throughout entire movement.