Lie on your back with your legs straight.
Ensure your legs are hip-distance apart.
lift one of your elbows to side.
Tighten your abdominal muscles and perform a sit-up, bringing your chest up.
As you sit up, rotate your body, bringing one elbow to its opposite knee.
Control the movement as you lower your body back down, and then repeat, bringing your other elbow to its opposite knee.
