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From aad.org, a report on dermatology and tanning and the sun and UV light:

Dr. Adams offered these sun-safety tips for outdoor fitness buffs: * If possible, seek shade between 10 a.m. and 4 p.m. when UV rays are the strongest. * Runners and those engaging in other outdoor sports should wear broad-spectrum sunscreen with an SPF of 15 or higher and reapply frequently when sweating. Stash sunscreen in your pockets as a reminder to reapply and wear dark-colored clothing which has built-in SPF, if possible. Hats should always be worn, and men should never run with their shirts off. * Skiers should be aware that snow is 80 percent reflective, even in shaded areas, and skiers are more likely to burn at higher altitudes. “Being aware of the skin problems that can arise from indoor or outdoor exercise is a crucial first step in keeping your skin healthy and getting the most out of your workouts,” said Dr. Adams. “If you have a concern about your skin, whether or not it's related to exercise, it's important to see a dermatologist for diagnosis and treatment.”