Typically sleds are designed to make hauling a heavy load over a set distance a little bit easier. Whether that load is a deer dragged out of the woods by a hunter, a kid’s sled barreling down a hill or Santa’s sled landing on a roof, the goal of moving a body of mass over a surface with ease is the same. But there are a few sleds made with the opposite goal in mind – making the task of moving a body of mass harder. These ‘power sleds’ are used in fitness training to build strength and stamina. Strength Squared, with locations in both Las Vegas, NV and Denver, CO, has only been making power sleds since 2010, but they have made a big splash in the market with an appearance on the NBC show, “The Biggest Loser” earlier this year.