2013 Day 19: Wall Sits
Step 1: Stand with your back against a wall, placing your feet about 10 inches from the wall.
Step 2: Bend your knees and slide your back down the wall until your thighs are parallel to the floor (or as far as you can comfortably go).
Step 3: "Sit" and hold for 10-15 seconds.
Step 4: Do 3-5 reps.