Design: The design is a randomized, placebo-controlled, double-blind trial. Each participant will receive 2 containers of gel. One container will be marked "LEFT" and one "RIGHT." One container will contain a commercially available arnica gel formulation, and the other will contain a placebo gel, identical in appearance to the arnica. Subjects will not know which container contains which product. Each participant will also be given a form containing an analog pain scale for each leg. The participant will rate his or her pain in each leg separately on the day before exercise. Each subject will then be asked to perform calf raises using the following protocol: