Bicycle Crunch

Lie down on your back, bend your knees, and plant your feet on the floor, hip-width apart

Place your arms behind your head, pointing your elbows outward

Brace your abs, Lift your knees to a 90-degree angle, and raise your upper body 

This is your starting position

Exhale and rotate your trunk, moving your right elbow and left knee toward each other, and simultaneously straighten your right leg

Pause at this position, then inhale

Exhale and then move your left elbow to your right knee and extend your left leg, and Pause at this position - this completes 1 rep