NOHrD WaterGrinder Works Your Arms, Abs, Back

Meet the NOHrD WaterGrinder: a fitness tool that uses water resistance to work your arms, shoulders, chest, abs, and back. Whether you want to become better at sailing or simply strengthen your body, this elegant machine can help. It features a polycarbonate water tank, touchscreen monitor, adjustable seat, and adjustable hand pedals.

You can use the hand pedals to change resistance level easily.

[where to get yours]