Between the sand, the sun, and the surf, exercising on the beach can get tricky. We asked fitness expert Andrea Shelby, owner of MV Fitness and Federal Hill Fitness, for exercises to help you tone while you tan. One caveat, says Shelby (who fittingly phoned in from Rehoboth Beach): “When working out at the beach, you don’t want to look ridiculous. Don’t run in a two-piece bathing suit, for...