Width is the spec that decides this, not length
Every buying guide in this category talks about length. For a full-motion machine the number that bites is width, because the arms sweep outward and you cannot put the machine in a corridor.
Published width, length, maximum user weight and maximum user height for the three full-motion machines we track| Machine | Width in use | Length in use | Max user weight | Max user height |
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| MERACH R26 Sculls | 29.5 in | 60.6 in | Not published | 76 in |
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| Sunny Health & Fitness SF-RW525023 2-in-1 Full Motion Rower with Core Trainer | 29.7 in | 56.2 in | 400 lb | Not published |
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| Stamina Body Trac Glider 1050 | Not published | Not published | 250 lb | Not published |
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Two of the three publish 29.5 and 29.7 inches of width. That is a foot wider than the YOSUDA magnetic rower and five inches wider than a Concept2, on machines that are 35 inches shorter. The trade is real and it favours a square room over a narrow one: a full-motion machine fits where a 96-inch erg cannot, provided you have width to give it. How much space a rowing machine needs has the clearance figures, and the arm sweep is the reason we tell people to measure both directions.
The Stamina publishes no assembled dimensions in a usable form, so the table says so rather than printing a guess. It does publish 38 lb and a 250 lb capacity — the lowest capacity figure on this entire site, and the reason we would not recommend it to anyone near 200 lb.
Why the MERACH is the one to buy
It is the only machine in the category with a flywheel. Hydraulic pistons are what make a full-motion frame cheap: they are small, they mount at the pivot, and they need no belt. They also heat up. Over a thirty-minute session the resistance you started with is not the resistance you finish with, which makes any kind of interval work guesswork. Hydraulic against magnetic resistance goes through the mechanism.
The MERACH publishes magnetic resistance with a performance monitor and Bluetooth, and it publishes the arc figure (120 degrees) and a 76-inch user ceiling, which no other machine in the category does. It is 85 per cent pre-assembled and uprightable. It is also the most expensive of the three by a clear margin, and we think that is the right place to spend here: a full-motion machine with drifting resistance is a novelty, and one with a flywheel is a training tool.
The Sunny is a different proposition entirely
The Sunny SF-RW525023 is the only machine on this site whose maker publishes a built-in back pad: a cushioned back-assist seat on six foam rollers, with a seat that either glides for normal rowing or locks at five positions along the rail. That second mode is what makes it unusual — it turns the machine into a fixed-seat upper-body station, so the arms do the work with the back supported.
Be clear about what that pad is and is not. It is for the fixed-seat and core exercises, not for the rowing stroke: no maker, Sunny included, publishes a backrest you row against, and best rowing machines with back support says exactly that at length. Sunny publishes 400 lb and a three-year structural frame warranty on this machine, which is three times the term most budget rowers print, and it is the pick if the reason you are looking at dual arms is that a long reach forward is the part that hurts.
Who should not buy one
- Anyone training for a 2k. The arc is not an erg stroke. Nothing you learn on a full-motion machine transfers to a Concept2 test or to a boat, and rowing machine against seated row explains why the distinction matters.
- Anyone over about 300 lb. One machine here publishes 400 lb. The other published figure is 250 lb, and the third machine publishes nothing — best rowing machines for heavy and tall rowers is the better list.
- Anyone rowing in a narrow room. Thirty inches of width with arms moving through it is not negotiable.
- Anyone who wants published resistance numbers. Hydraulic cylinder levels are not comparable between machines, and only the MERACH gives you something a second machine could be measured against.
If what you actually want is one frame that does two jobs rather than one stroke that works differently, best 2-in-1 rowing machines is the page next door — and the Sunny appears on both, because it is the only machine that genuinely belongs in both categories.