The spa that made Strong®. Our Strong Spas Premium Plus Line is the definition of spa luxury. Surround yourself in opulence with features and amenities that deliver the rejuvenating and refreshing hydrotherapy of Strong Spas to you at literally the touch of a finger. We’ve designed every feature with your relaxation in mind. From our ergonomically designed Lounger seating, to the location of our dozens of hydrotherapy jets, to the engineering, performance and efficiency of our Premium Plus Line, you can own and revel in the peak spa experience.