Both competitive and recreational rowing are unique in comparison to most sports because they exercise all of your major muscle groups. Everything from your legs, back, and arms are engaged while rowing. In addition, rowing is a low-impact sport. When executed properly, the rowing stroke is a fairly safe motion, providing little room for the serious injury often found in contact and high-impact sports. 1

As far as “racing”, I said an air rowing machine is better because the Concept2 is the only model used for indoor rowing competitions, setting world records, and entering your actual scores online. It is because their monitor can calculate the drag factor of the flywheel in real time and accurately calculate distance and time. Small changes such as dust build up, air temperature, and humidity will not change the times between different machines because the drag factor is calculated every stroke.
The machine is well constructed for a consumer device. The control panel does not accurately measure distance. It's off tenfold. I've contacted the manufacture about the issue and first I was told it should only be used for comparison purposes, then I was told it would be too expensive to provide a product that didn't show 1 km as 0.1km. Yes, these are ridiculous excuses.
The Waterrower has recently been made famous by Kevin Spacy as the rowing machine used in the ‘House of Cards’. It is a type of wooden rowing machine produced and manufactured by Waterrower Inc. in New England, USA. The rowers were designed by ex-US national team rower john Duke in the mid 1980’s and the company to manufacture them was established in 1988.
In sweep or sweep-oar rowing, each rower has one oar, held with both hands. This is generally done in pairs, fours, and eights. In some regions of the world, each rower in a sweep boat is referred to either as port or starboard, depending on which side of the boat the rower's oar extends to. In other regions, the port side is referred to as stroke side, and the starboard side as bow side; this applies even if the stroke oarsman is rowing on bow side and/or the bow oarsman on stroke side.