2013 Day 41: The Casual Lean
Step 1: Facing out, stand with your feet about 8 inches from a wall and then lean back against it.
Step 2: Place your right arm on the wall, with your hand flat against it and your elbow bent.
Step 3: Push away from the wall until your arm is straight.
Step 4: Do 10-15 reps, then switch arms.