Lie on your back with your arms extended directly above your chest and your palms facing toward each other. Bend your knees and bring your legs into tabletop position, ensuring your knees are stacked over your hips and your shins are parallel (in line) with the floor. This is your starting position.
On an exhale, draw your ribs to your hips to engage your core. Draw your left arm back and down toward the floor alongside your head. 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, not letting your back come off the ground.
On an inhale, raise your left arm and right leg to return to the starting position. This counts as one rep.
Continue alternating between the left and right sides, completing 16 reps.