Single-leg bridge with feet elevated - version 1

Lie on your back. Place one heel on a stool with your knee bent. Lift the other leg up and straighten the knee.
Tighten your buttock and abdominal muscles, and press your heels into the step.
Lift your hips up, so that your weight is on your shoulders.
There should be a straight line from your shoulders to your knees.
Control the movement back to the start position.