Like the integration of Peanut Butter and Jelly, the Swimming Pool and the Hot Tub (or Spa) is one of the great combinations in the history of the world. Adding a hydrotherapy pool to any swimming pool environment provides stress relief, injury recovery, and general relaxation. Spas can either be a stand-alone vessel, or integrated into the swimming pool design in a number of ways: Inside the pool, Outside the pool on grade, outside of the pool and elevated or raised, as well as variants on the aforementioned themes.