The experience of pulling an oar across the water is not easy to replicate. In a river, the resistance over the course of a stroke, from the oar’s catch to its release, feels uniform. Whereas some indoor rowers try to recreate the life aquatic with magnetic braking, hydraulics or air resistance, the WaterRower S1 has a paddle that spins inside of a tank of water. The push back is smooth and accompanied by a gentle whooshing sound. As with sculling a racing shell across the Charles, the physics of the S1 will automatically ramp up the load to match the intensity of your stroke, so there are no settings to adjust. The original WaterRower was handcrafted from hardwood, but the S1 uses perforated stainless steel with rails that are about an inch thick. This makes the rower convenient to dock in your living space: You can store it standing on end; its footprint is about the same as a dining chair’s.