After hurting himself jogging a year ago, Dennis Drake took to swimming laps at Veterans Memorial Park to stay in shape. "The best aerobic exercise for me now is in the water," he said. Swimming the butterfly and other strokes adds variety to his workout. "I'm just a recreational swimmer doing competitive strokes," he said. He is also a lifeguard and swim instructor at the pool, which is closed Mondays for maintenance. But after the chores were done Monday, Drake took to the water.