The Hydrorider Aquabike Professional is a unique aquatic indoor stationary bike made out of marine stainless steel AISI 316L (rust proof) which allows you to pedal while immersed in the water taking advantage of the many benefits of the aquatic environment. Unlike indoor based cycling frames, the Hydrorider resistance is determined by four paddle wheels that are adjustable on three levels the longer the paddle is pulled out, the greater the surface volume of water taken in; hence, the greater the resistance. Resistance is also added by increasing RPMs through acceleration which is a key component in aquatic conditioning. Additional challenges can be met by a change in seat positions, intervals or power pull techniques. The bike has state-of-the-art features for custom fitting anyone. It has fore and aft seat and stem adjustment for handlebars. Bases are extendible for better pool depth in order to reach participants body position with water level between waistline and chest. For maximum results it is recommended to use aquagym shoes (provided by Hydrorider at clients request).