For a third option, you can look to hydraulic machines, which use pistons to generate resistance. Hydraulic rowers are quiet, and they also tend to be smaller and cheaper than other kinds of rowing machines, but you won’t get the same smooth rowing feel, or the consistency of resistance, that you would get with an air or water rower. What's more, reviewer after reviewer has found them unreliable and high-maintenance.

Row your way to fitness with this water rowing machine from WaterRower. The A1 S4 Rose is a low-maintenance exercise machine that'...s constructed from high quality ash wood with aluminum mono rail, Rosewood staining, and Danish oil finish-perfect for both residential and commercial use. Engineered with the patented WaterFlywheel resistance method, it gives off life-like water rowing experience while the low noise level and minimal intrusion along with the unique self-regulating resistance with infinite variable allows this exerciser to suit any user without the need for adjustments. With its no impact and non-load bearing, this gym equipment is also made perfect for users with joint problems. Exercise all major muscle groups like the arms, legs, back, shoulders, core, etc. and see how great you're doing with the help of the S4 monitor that comes with the package. It monitors time per 2 or 500 kilometers, watts, calories burned per hour, distance, and the total time of workouts. This exercise machine's awesome features don't stop there! It also boasts minimal maintenance with no lubrication needed. You simply need to add purification tablet every 3-6 months (tablets come with the package). Storage is easy as well. Simply tip the machine vertically and you can easily lean it against a wall or hide it inside a closet. Moreover, enjoy 1 year manufacturer warranty (can be upgraded to 3 years parts and 5 years frame warranty for free with registration) and free shipping when you purchase your unit from Dazadi. Get it today! read more
Here’s a secret, because the rowing machine provides an intense full body workout, the exercise burns a high amount of calories not only during the actual activity but also for a period after you’ve stopped. This is known as the “after-burn effect”. Essentially, you’ve worked your body so hard that it is forced to keep burning calories and fat even when you’re not rowing. The scientific jargon for this is “excess post-exercise oxygen consumption” or “EPOC” for short. But all you need to know is that if you’re doing an intense rowing workout, the benefits continue after you’re done. How great is that?
Are you big and tall or small and dainty? Pay attention to maximum weight capacity when choosing a rowing machine. Also, those blessed with medium height know nothing of the struggle, but both particularly short and particularly tall people can find themselves with specific needs when it comes to working out, including finding some rowing machines uncomfortable or ineffective. If that's you, be sure to check the specifications and reviews before you buy.

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 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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