Lie back on the floor and bring your knees above your hips with bent legs. Cross your left foot across your right knee, so that your left knee sticks out to the side. Place your hands on the back of your right knee and gently draw it toward you. This will stretch various hip flexors on your left side.
Hold or gently increase the stretch for 30 to 60 seconds. Repeat with the right knee out to the side.