Don't know why, perhaps due to rising demand and production bandwidth, but be forewarned quality control is an issue. Assembly is easy enough, though have gap where back separator does not fit snugly after tightening nuts as firm as they will go (see pic). No water level sticker on tank received, so had to measure water manually according to calculations (4 gallons). Siphon was not air tight (even though release valve closed firmly), so had to manually pump instead of siphon. S4 monitor only flashes, not working as of yet and now have to take a apart top of unit to figure out why, currently not resolved after verifying connections and looking at simple solutions on website.
The WaterRower US office got in on the Pull for a Cure fundraising action and all pulled together to raise money for breast cancer! - - - - As many of you may already know, throughout the month of October, WaterRower has been raising money through our Pull for a Cure fundraiser. For each 500m workout rowed and posted online, we'll be donating $1 towards breast cancer research! Don't forget to get your workouts in before Monday, October 31st! #PullForaCure #WaterRower
The water flywheel is comprised of two paddles encased in an enclosed tank of water. As you pull the cable, the paddles move through the water creating resistance. The beauty of this machine is it uses the mass/density of water. The paddles create the drag, so the harder you pull, the more resistance increases. Think about moving your hands through water. The faster you go, the more dense water feels. The slower you go, the less you feel the resistance. And this type of resistance is excellent for your joints. Click here to read the full review.
The Challenge AR features an advanced computer monitor providing the rower with measurable performance output, an ergonomically designed seat that rides on precision bearings and rollers for absolute smoothness, an upgraded footboard with advanced heel support, and an innovative soft grip handle to eliminate stress on the hands and wrist during the comfortable, but physical workout.
* While there is nothing to adjust from row to row on the WaterRower, it is possible to increase or decrease the level of resistance by changing how much water you put in the drum. The monitor is pre-calibrated to match 17 liters of water, but you can change that if you want. More than 17 liters = more resistance, up to the max fill line. This is not something you'll want to change frequently, it's more of a set-it-and-forget-it thing.
Note: Some states do not allow limitations on how long an implied warranty lasts, so the above limitations may not apply to you. Some states do not allow the exclusion on limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Because of the vast array of products that might contain one of the chemicals or ingredients on the list, we must include Proposition 65 warnings in our communications with you. We are required to use exact wording as specified by the state of California. While the warning sounds alarming, the purpose is to notify you of the potential risk so that you can make an informed buying decision.
The advantages with air rowers is that there is smooth action; there is only small wear and tear to its mechanism; its automatic feature adjusts according to your rate of strokes; and there is a wide range of the resistance readily available in replicating the feel of rowing through the waters. The only disadvantage of this machine is that it tends to be noise indoors.
When feet are in position and you are seated, ensure you are sitting in a tall yet relaxed position. Try to feel as if you are sitting on your ‘sit’ or ischia bones and rock slightly forwards and backwards on these bones. Your body weight will move from the front to the back of the seat. Ensure you are sitting with a locked core, shoulders relaxed and head looking forwards.

After reading so many fantastic reviews I purchased the Classic model. Before I write what I think are the negative aspects I'll say that it gives a great workout! That is pretty obvious and I don't think that part is arguable. The disappointment began while unpacking. The wood parts were wrapped fairly well and did not have damage but there were several scratches that I had to sand out and re-oil. It appears that they were there before shipping. Putting it together would have been fast and easy- except 2 of the bolts were bent at about 15 degrees and would not fit. I had to wrap with tape and bend with vice grips. After getting it all together the rower worked well for about a week. I started to notice an annoying kind of popping sound from the left rail as the wheels rolled over on each stroke and recovery. It seems the plastic that the wheels ride on is not flat or adhered well to the rail. It isn't very loud but I can hear it well and it gets my attention, spoiling the nice sound of the water. Really disturbing. Support at WaterRower would like a video of the issue. Seems like an obvious issue and could swap out with a rail that is good instead of me trying to make a video of this small sound while moving the seat back and forth. For a $1500 machine the quality control- or lack of it is disturbing. Having to jump through a bunch of hoops because they are too cheap to just send a part is even more so. Perhaps I am being difficult but it is upsetting to have something touted as so great but put together like a $200 piece of junk. Another complaint would be the lack of any back lighting on the monitor. Really cannot see it if the lights are low. Being able to remove the monitor to attach to a PC wouldn't hurt either. While it gives a good workout the rower really suffers from poor manufacturing.
 The amount of water in the tank simulates the weight of the boat and crew, the more water in the tank the heavier the boat and crew. The standard Calibration Level is Level 17. If the user is lighter in weight, Level 15-16 can be used. If the user is heavier in weight, level 18-19 can be used. The maximum level to fill the tank is Level 19. DO NOT fill above the maximum level – this could void the warranty.
From a fitness perspective, the WaterRower Natural works 84 percent of your muscle mass, helping tone and strengthen your muscles while burning far more calories than most other aerobic machines. The exercise is also low impact, as it removes all the body weight from the ankles, knees, and hips, but still moves the limbs and joints through a full range of motion--from completely extended to completely contracted.
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