Begin in a high plank with your hands on the second or third stair (the lower you go, the harder the move will be). Your hands should be under your shoulders, your core pulled in toward your spine, and your back flat.
Bend your elbows, lowering your chest to about elbow height with your triceps parallel to your ribs. Keep your core pulled in throughout the movement.
Drive through your hands to push away from the stairs until your arms are straight and you're back in the high plank position.
Pull your right elbow back, lifting your hand toward your chest. Keep your core tight and avoid rocking or turning your body, ensuring your hips stay facing down.
Place your right hand back down, returning to the starting position.
Repeat on the other side. This counts as one rep.
Complete for two sets of 12 to 16 reps, resting for 45 seconds between sets.