Lie down on your side with your elbow under your shoulder, supporting some of your weight. With your legs straight, stack your feet on top of each other. You can put your top hand on your hip.
Raise your body off of the ground by pressing your elbow into the floor, squeezing your glutes, and tightening your entire core.
Your elbow should be directly under your shoulder as you form a straight line from your heat to your feet.
Hold for as long as you can while keeping good form. Make sure your chest stays up and your hips do not sag.
Rest and repeat.