The Nohrd WaterGrinder has been designed to replicate the sailing action of the guy they call theGrinder' whose task is to transform wind into propulsion by hoisting the sail as quickly as possible. This requires a huge amount of physical power and endurance. By rotating the WaterGrinders adjustable crank arms the motion is simulated exactly and the resistance comes from the water that is encased in the beautiful curved water-drop wooden frame. The independent, height-adjustable crank feature, provides symmetrical and reciprocal grinding, as well as both one and two-sided arm input. The WaterGrinder initiates endurance training through your arms; muscles are not usually associated with this form of training. The result is quick muscle fatigue, plus an increase in strength and endurance simultaneously and granting you an extremely efficient, exhilarating short training session. The hand pedals can be set at various heights positions which affect the resistance, the smaller the rotatio