A:Answer Hey there - We suggest using your Crewmaster Rower on a flat and level surface. You may purchase a machine mat to use under your rower, but as long as the surface is flat and level, you should have no problems. If there is anything we can do to help, please don't hesitate to reach out! Our Live Chat team can be found online at https://www.bowflex.com/ by using the Live Chat link at the top right of the page when our agents are available. We are open Sunday – Saturday from 7am to 6pm PST. You can also speak us over the phone at at (800) 605-3369, Monday – Friday from 6am to 5pm and Saturday from 7 AM to 4 PM PST. - Schwinn Fitness Team