From Head to Knee, lie flat on your back. Lift your right leg into the air. Lift your torso off the mat, and hold onto your big toe with the first two fingers and thumb of your right hand. If you can't reach your toe, hold your ankle, calf, or behind your thigh. Feel free to use a strap if you prefer.
Keeping your torso lifted will engage your core, but if you want to enjoy a more relaxing stretch, rest your torso on the floor.
Hold for five breaths, and then repeat on the left side.