Weighted Donkey Kick

On hands and knees, hands under shoulders and knees under hips, tuck a dumbbell into the crease behind one knee to hold it in place. Keeping that knee bent at the same angle throughout, drive your heel up toward the ceiling by squeezing your glute, rather than arching your lower back to gain height. Your torso stays level and still, if your hips rotate or your back sags as you lift, you have gone higher than your glute alone can control. Lower with control back to the start rather than letting the weight drop, then repeat on the same side before switching.