Sharing many of the same features as the VR500, the VR400 takes a step towards simplicity with the manual resistance controls. Set your resistance and go! Its as simple as that. Perfect for those who want to blast out a quick 500/m during an interval training session. Or someone who enjoys a nice long and steady 10k. Ultra smooth industrial grade bearings housed inside the friction free rollers combined with the ergonomically designed contoured seat and precision extruded aluminum track provide even the most seasoned professional rowers one of the best "out of water" rowing experiences available.