To do Double Climbers, set up in a forearm front plank with your feet about hip-width apart and your elbows under your shoulders. Your body should be in a nice straight line from your head to your heels.
Holding this nice plank position while bracing your abs, tuck one knee up and outside your body toward your elbow. You can rotate just slightly and look at the knee but do not let your hips sag or your butt go up in the air. Also, make sure your elbows stay under your shoulders.
Place the foot back and tuck the other knee up and outside. Place that foot back.
Then place one hand down on the ground under your shoulders followed by the other hand to climb from a forearm plank to a high plank. Try to brace your core as you climb and not stick your butt up in the air.
Then, from this high plank position, perform another knee tuck up and outside on each side. Then climb back down.
Alternate which hand leads the climb and make sure one hand isn’t always leading! Remember in each plank position to do a knee tuck on each side!