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How can I freshen my hair at the gym without washing it?

—Kelsey Pasmore, Chicago

Bobbi: Two words: dry shampoo. Discovering this product has changed my life! Dry shampoos are powders that contain cornstarch and/or silica to absorb sweat and oil. Flip your head over and apply the powder to your hair's under layers. Then add a little to your hairline and part, gently patting it in with your fingers. Give your head a big shake, an voila! An instant, fresh style.

Next: I wash my hair at night. How can I freshen it in the morning?