Water rowers are just a recent invention followed by the air rower, which utilizes paddles and water in order to create the resistance. While there are a lot of people who prefer the air rower compared to this one, there are also people who prefer the water rower because it has a smoother, quieter feel of the action, especially when emulating the movement of water rowing. Like the air rower, this machine is able to burn calories and work up your muscles through offering resistance to your movement while sitting on the sliding seat. The more resistance there is, the more it makes it harder to work on the machine and your workout becomes more challenging.
The rowing machine itself is unlike any other on the market with its patented water filled flywheel. It is hard to exactly copy the action of a scull on the water, but the mechanics of the flywheel spinning in water comes in a close second on dry land. The fact that the water is 800 times denser than air means that there is no need for any extra resistance or dampening that you will find in normal air rowers. The faster you pull, the more resistance is generated giving it infinite variability. However, if you want to be able to practice rowing with a faster stroke, you will have to reduce the amount of water in the tank unlike an air rower where you just have to adjust the baffle.