Obsidian Surge 500 Rowing Machine by Sunny Health & Fitness is the ultimate home gym gadget. It works as intuitive rowing machine meaning that its 16 fan blades act as a real water. The faster they spin the more resistance they give thus creating the feel of real water resistance while rowing the boat. This home gym gadget is ideal to keep your form at a high level during the winter months. On integrated display you can track all the major metrics like total time, 500 M time, SPM, total strokes, calories, ambient temperature, and more. The Obsidian Surge 500 can be stored upright when not in use for minimal space occupancy.