Posterior Plank Mountain Climbers
To do the Posterior Plank Mountain Climbers, sit on the ground with your legs out straight in front of you and your hands down behind your butt on the ground.
Then, driving up through your heels and your hands, press your hips up toward the ceiling and press your chest out. As you bridge up, squeeze your butt and lift your hips up as high as you can while keeping your legs straight and your chest pressed out. Do not shrug your shoulders at the top as you press your chest out.
Hold at the top with your body in a nice straight line. Do not hyperextend your back. Then slowly tuck one knee in toward your chest. Tuck it in as far as you can.
Then straighten the leg back out. Place the foot back down then tuck your other knee in. Feel your glutes and hamstrings working to hold you up as your abs work to tuck your knee in. Beginners can start with a tabletop variation as they tuck instead of the full Posterior Plank.