Running is tough on the body. Even with proper footwear and a feather-light landing, all the contact with pavement eventually adds up to occasional pain in the feet, knees, and leg muscles. Another simple way runners treat pain is with kinesiology tape (K-tape), a fabric tape with a bias in the weave so it stretches in one direction and not the other. "This creates a bio-mechanical lifting mechanism that lifts the skin away from the soft tissue underneath," according to K-tape brand RockTape's website, "which allows more blood to move into the injured area to accelerate healing and recovery." We saw it all over athletes at the London Games. For example, if you're experiencing some achilles pain, you'd tape from the bottom of the foot up to your calf, and perpendicular across the tendon, leaving the tape on for several days. You might also cut back on training – but you didn't need us to tell you that. [$20; rocktape.com]