1) Lie on your back and bring your legs up to table-top position with your hips and knees at 90 degrees.
2) Raise your arms straight up vertically over your head.
3) Keeping your back flat, lower the opposite arm and leg away from one another towards the floor.
4) Do not allow anything else to move and make sure your back stays flat on the floor.
5) Return to the start position and repeat with the other pair.
