Water Rower - A1 Studio - S4 ComputerThe handcrafted WaterRower A1 S4 Select Rower uses a patented Water Flywheel to emulate the natural feel of rowing through water, delivering a highly efficient aerobic workout. Easy on the joints, it targets all major muscle groups uniformly. The rower features an S4 performance monitor which offers distance, time, interval and optional heart rate training sessions. The S4s PC connectivity also lets you track your essential exercise data like speed,