Ergometer rowing machines (colloquially ergs or ergo) simulate the rowing action and provide a means of training on land when waterborne training is restricted, and of measuring rowing fitness. Ergometers do not simulate the lateral balance challenges, the exact resistance of water, or the exact motions of true rowing including the sweep of the oar handles. For that reason ergometer scores are generally not used as the sole selection criterion for crews (colloquially "ergs don't float"), and technique training is limited to the basic body position and movements. However, this action can still allow a comparable workout to those experienced on the water.
The tank of the WaterRower Oxbridge Rower is made from polycarbonate, one of the strongest plastics available. It is virtually indestructible. The tank is sealed and can be filled with municipal water via a small opening closed by a stopper. This water typically contains enough chlorine to remain clear for some time. After exposure to light, the chlorine will degrade; the chlorine tablets should be added periodically.
In the 1950s- and 1960s, more sports coaches began to use rowing machines for training and assessment of athletes' performance. One such rower developed at this time was the Harrison-Cotton machine, the brainchild of John Harrison of Leichhardt Rowing Club in Sydney and Professor Frank Cotton, produced by Ted Curtain Engineering. This was the very first piece of equipment able to measure athletic power with great accuracy, and it also imitated the actual experience of rowing more closely than any previous rowing machine.

WaterRower Dimensions: 83 L x 22 W x 21 H Inches / Weight: 108 Pounds (At Minimum Water Level) / Storage Dimensions: 21 L x 22 W x... 83 H Inches (Easily Store It On End)Built For Home Use & Practically Maintenance Free, Rowing Machine Targets All Major Muscle Groups (84% Of Total Muscle Mass) W/ Excellent Adjustable Resistance Levels / Made W/ Decay Resistant Solid Black Walnut That Displays A Natural Richness & Luster Of GrainBoasts A Patented Water Flywheel That Mimics The Natural Dynamics Of Rowing Yet Suitable For Users W/ Joint Concerns (Chlorine Tablet Is Available Free Of Charge) / Entry Height Is At 12 Inches (At 20 Inches W/ Optional Hi-Rise Adaptor)Comes W/ The S4 Performance Monitor For QuickStart Of Functions And Displays Intensity, Kcalories Per Hour, Strokerate, Heartrate, And More! / Noise/Intrusion Levels: Soothing & Relaxing/MinimalEnjoy A 1 Year Manufacturer's Warranty (Upgradeable To 3-Year Parts While 5-Year Frame Is Free Of Charge W/ Registration) read more
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.
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