Pool and Hot Tub Family's Newest Addition Within the last decade, the pool and spa family has had a new addition called a Swim Spa. A Swim Spa is a minipool that allows a person to swim in place against a current. According to people in the industry, a Swim Spa is a combination of a hot tub for relaxation, and a minipool for exercise or entertainment. By purchasing a Swim Spa a person is investing in the most important thing they can, themselves. The advantages of a Swim Spa start in your backyard, and are limited only by a person's motivation.