Hair That Packs a Punch

If you are a swimmer

"Laps may keep you lean, but chlorine can erode the outer layer of hair and leave a residue; it also gives blondes a green tinge," says Nathaniel Hawkins, a celebrity hairstylist in New York City.

Your plan: Detox

Use a shampoo that will remove chlorine buildup, like René Furterer Repairing After-Sun Shampoo ($23, renefurtererusa.com for salons). Before you swim, wet strands in the shower so they won't absorb as much pool water.