Position yourself on all fours with your knees under your hips and your hands under your shoulders.
Tighten your abdominal and buttock muscles as you push yourself up through your arms, keeping your body straight.
You should have a straight line from your shoulders to your heels.
Drive the heels of your hands into the floor so that you fix your shoulder blades fully against your rib cage.
Be careful not to just round your upper back.
Keeping this control at the shoulder blades, and keeping your elbows straight, drop down into a press-up.
Return to the starting position
Ensure you do not allow your hips or abdomen to sag.
Repeat this movement.