From the LA Times' "Good Form" column today:
"Lying down on the floor with your legs resting against a wall is an excellent way to relax and re-energize. These two poses are especially helpful for stretching and relaxing your inner thigh and hip muscles. It's best to do them after a workout or whenever you have time to stay in the positions for a while."
Check out the photo demonstration and read more on this here:
"Good Form: Wall aids in thigh and hip muscles" (LA Times)