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, Quiet & Smooth Rowers with 32 Levels of Resistance and 300LB Weight Capacity, Indoor Row Equipment with Bluetooth, App Supported and Tablet Holder
Merach Rowing Machine, Magnetic Rower Machine for Home, 16 Levels of Quiet Resistance, Dual Slide Rail with Max 350lb Weight Capacity, App Compatible with LCD Monitor, Q1S
YPOO Rowing Machine, Magnetic Rower Machine for Home, 16 Levels of Quiet Resistance, Dual Slide Rail
