builds endurance, muscle strength and cardiovascular fitness;
helps maintain a healthy weight, healthy heart and lungs;
provides an all-over body workout;
alleviates stress and - by swimming with like-minded others - is good for your mental health;
improves coordination, balance, posture and flexibility; and
provides good low-impact therapy for some injuries and conditions:
can be done all seasons, all year:
suits any age, body type, and ability, and....
swimming with a group helps you keep motivated, build friendships, and receive reward for effort.