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.
Rowing Machine,Magnetic Rower Machine for Home,350 LB Weight Capacity, S
Rowing Machine, Magnetic Rower Machine for Home,350 LB Weight Capacity, Smooth W
Everfit Rowing Machine Air Rower Exercise Fitness Gym Home Cardio
Home Gym Rowing Machine Hydraulic Rower 12 Level Resistance Cardio Trainer AU
