Cardiovascular training involves any activity that requires the use of the large muscle groups of the body in a regular and uninterrupted manner. Rowing is one of the few non-weight bearing sports that exercises all the major muscle groups. In addition, the consistent and all encompassing activity associated with rowing, combined with being outdoors on the water, has an unparalleled impact on reducing stress.2
Unfortunately, the direction of water movement at the top and bottom of the wave (thick arrows) rotate the boat in the direction you don’t want to go. As you realize this you try to pull your down-hill oar up out of the water, but this just pulls you over more in the bad direction. I spare you, gentle reader, a picture of the result. As the wave carries your boat up to a crest you try to lean into it to keep the boat level, but it’s natural to also push down on the down-hill oar to help.
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.