Lie on your back with your arms vertically extended and your hips, knees and feet at 90 degrees,

Brace your torso by breathing into your stomach and flexing your abdominal muscles in order to keep your lower back against the floor.

Forcefully exhale through pursed lips while extending one leg out while simultaneously extending the opposite arm overhead to the floor.

Return your extended leg and arm back to the starting position before extending the opposite leg and arm.