Lie on your back with your arms extended upward directly over your chest. Bend your knees and bring your legs into tabletop position, ensuring your knees are stacked over your hips and your shins are parallel with the floor. This is your starting position.
Draw your ribs in to engage your core. Bring your left arm back and down toward the floor alongside your head, and at the same time, extend your right knee and hip to lower your right leg toward the floor. Ensure that your arm and leg are lowering at the same speed and that you maintain a neutral spine.
Raise your left arm and right leg to return to the starting position. This counts as one rep.