Physical therapy: $2.50.
Using a only a lacrosse ball—about three bucks at any sporting-goods store—you can work a lot of tension out of tight tissue.
Working with an athlete at CrossFit Santa Cruz, Kelly Starrett uses a ball to treat the internal and external rotators of the shoulder, the triceps and the lats. By getting creative and taping a pair of balls together, Starrett is able to do a little maintenance on the facet joints and erectors around the spine.
The rules are pretty simple for this kind of work: do it for a couple of minutes, and roll until something feels different. Starrett also says a glass of wine can help.
Starrett is the owner of San Francisco CrossFit and a doctor of physical therapy.
Additional reading: Muscle Damage and Soreness: An Overview by Tony Webster, published Nov. 5, 2008.