Start on your hands and knees, with your hands under your shoulders, and knees under your hips.
Tighten your abdominal muscles, keeping your back straight and your gaze between your hands.
Lift your leg diagonally backwards and out to your side, keeping your knee at 90 degrees.
Your thigh bone should travel at approximately 45 degrees.
Control the leg back to the starting position and continue.
Ensure you keep your elbows straight and your abdominal muscles strong.
Minimise how much your pelvis rotates with the movement.