The WaterRower A1 model comes with a black aluminium mono-rail and a 5 button monitor imbedded in the footboard. Wood has been chosen due to its marvellous engineering properties, primary amongst these is its ability to absorb sound and vibration enhancing the WaterRower's quietness and smoothness of use. Ash, like all woods used in WaterRower construction, is a premium hardwood with incredible longevity and dimensional stability. Rowing has long been recognised as the most complete aerobic exercise Works 84% of the muscle mass- more than any other exercise, rowing recruits all major muscle groups Maximises gain, minimise time- derive maximum benefit from an all body workout and burn more calories in less time Kind to the body- no impact or load on the joints, suitable for all, young or old, male or female, big or small, fit or unfit Relaxing to the mind- smooth and rhythmical, a joy to use Combines Aerobic and Resistance- unique combination of aerobic and anaerobic benefits.