Start by lying flat on your back. Stretch out both legs, keeping a slight bend in your right knee to protect your lower back.
Wrap a resistance band around the middle of your left foot. (If you don't have a resistance band, a rolled up towel, light blanket, or the belt of a robe can also work here.)
Keeping your left leg straight, slowly bring it up to the ceiling as shown, holding the resistance band with your right hand. Make sure to keep your right shoulder and elbow on the floor as you do this.
Now, move your left leg across your body, lowering it toward your right side until you feel the stretch on the outside of the leg. Keep your hips on the floor and your core engaged.
Hold for 20 seconds before returning to the starting position.
Repeat with the right leg, pulling it over to the left side to stretch. Do this stretch twice on each side.