Setup
Lay on your back with knee bend up in line with your feet and centered under your trunk, arms at your sides.
Movement
Elevate one leg off the ground, tighten your glutes and core and drive through the leg on the floor to lift your hips off the ground, slowly return to the start
Tip
Attempt to have knee, hip, and shoulders in a straight line at the end of the movement
You can alter your elevated leg by keeping the knee bent or keeping it straight with your thigh tight, with your thigh parallel to the other thigh