Swimming is an excellent activity for any fitness level, from beginner to pro athlete. Swimming offers a change to your workout or rehab. Swimming is a very healthy, fun and challenging form of exercise and also is a very low impact aerobic exercise. Swimming is used in pro sports all the time for rehab. Regardless of ability and experience, people of all ages can swim. Swimming is an ideal activity for those who are aging or can no longer bear the high impact and joint stress of running or jogging.