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Seventy percent of women have this problem, according to a Neutrogena survey. "If you wipe away sweat when you're working out, you can reduce the value of an SPF 30 to a much lower, less effective SPF," Dr. Fox warns. To protect skin, apply a shot glass's worth (many women often slather on a quarter of this amount) head to toe and reapply every two hours and after swimming or sweating. A higher SPF isn't necessarily better. "You're safer putting on an SPF 30 every two hours than you are applying an SPF 100 once a day," Dr. Fox says. Try new formulas, such as Neutrogena Wet Skin Sunblock Spray SPF 50 ($10, drugstores), which can be applied directly to damp skin, and Own Products SPF 30 Orb ($15, ownproducts.com), a clear zinc oxide formula that doesn't rub off. Dust a powder SPF, like Colorescience Pro Sunforgettable Loose Powder Jar SPF 50 ($40, colorescience.com), along your part to shield your scalp.