It is more stable than one rail. It prevents the flip-over when rowing. It is partially pre-assembled and can be moved around easily.
GarveeLife Rowing Machine,Magnetic Rower Machine for Home,14 Level Magnetic Resistance,Exercise Equipment,350 LB, Double-Scull Rowing Machine,Patented Sculls,Foldable Rower for Home Use
WELLFIT Rowing Machine, Magnetic Rower Machine for Home, Compact Upright Storage Rower for Small Space, 8 Levels Adjustable Resistance, 300lbs Weight Capacity, Works with Kinomap, Black-Blue
HYTY Folding Magnetic Rowing Machine, Magnetic Rower Machine for Home with 48" Slide Rail, 8 Levels of Quiet Resistance, Bluetooth LCD Monitor and Tablet Holder & Comfortable Seat Cushion, 300 lbs
Rowing Machine, Magnetic Rower Machine for Home, 16 Levels of Q1S - Magnetic
