The WaterGrinder, an upper body training device developed from sailing, is based on the successful WaterRower water resistance principle. In sailing, the Grinder's job is to convert wind into propulsion by hoisting the sails as fast as possible. The grinders do the back-breaking work on board and are corresponding high-performance athletes. Using their muscle power and endurance, they move the winches on the ocean-going yachts and thus wrestle the sails into a vertical position. The modern way of doing this is via a classic crank movement. The WaterGrinder now offers you the possibility to practice this sport at home and to achieve the fitness of a racing grinder without having to do without the element of water.