The Ergatta Rower leverages water resistance to scale naturally with your effort. The harder you pull, the more resistance you will receive from the rower, smoothly increasing throughout the rowing motion to stay light on your back and joints.
If you wish to change the scale in which the rower resists you, you can easily add more water to the tank. This will provide greater resistance per degree of effort. Remove water for the inverse effect. Generally, Ergatta members prefer to use the machine at the stock water level provided upon delivery.