Meet the Daytona Challenge Water Rower: a rowing machine that gives you a tough workout indoors. Designed for beginners and pros in mind, the rower comes with a fluid resistance system, allowing you to tone your shoulders, back, legs, and arm.
More gadgets like this ➡️ : here
Just adjust the green valve to control water transfer from the inner to the outer tank. Not the cheapest rower around though.
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