When it comes down to it, the challenge of staying in shape isn’t just physical, but mental too. Well, with the Revolution Dumbell, you won’t get psyched-out by the size of the weights you’re lifting anymore. These handheld gadgets, which were designed by Sang-Hoon Lee, let you program how heavy they get. Each rod contains tiny spheres that spin at varying speeds—the faster they spin, the heavier the weights feel. Now you have no excuse to not stay focused…fatty.
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