Swimming is a big part of our lives, but it’s not the only thing we think about. Thoughts about family, work, and what’s for dinner can float through our heads as we float through the water. This isn’t necessarily a bad thing; swimming is a great way to relieve stress and relax, even while we’re working hard. Singing, thinking about to-do lists, and anticipating an upcoming vacation are all legitimate things to do as we crank out laps to get a good cardio workout.