The swim jets in SwimCross Exercise Systems are designed for both swim and water-workout options suitable for all ages, sizes and skill levels. A total of five swim jets, driven by two pumps, provide a steady stream of water that is more powerful than the average jet. The swim jet uses a venturi effect, not air, to draw-in or entrains more water, effectively multiplying the volume of water. This design feature results in stronger resistance for swimming with less turbulence than other swim spas on the market. And, swimmers will find it easier to stay centered and afloat, thanks to the jet configuration, which is designed for the top jets to provide resistance while the bottom jets provide lift. Simply toggle the three top jets between two speeds and the two bottom jets between on and off – a total combination of five output levels – for easy workout customization.