Skip the pool and ride your bike and/or work out at the gym instead. Swimming and water aerobics are good for fitness, but not so much for losing weight. I read an interesting study that found that the same exercise in a very warm pool, vs a cool pool burned the same amount of calories, but the cool pool exercisers were more hungry and ate more after their workouts. Apparently the cool temperature supresses the hormone system that controls appetite. The same goes for cool weather bike rides so the suggestion was warm up on the trainer at home after a cold ride to warm up your core and avoid over eating.