What's the optimal speed for exercise? http://53eig.ht/1fPQ5K3 pic.twitter.com/bo8O1sjxNV
@FiveThirtyEight Forget walking/running speed. Just move heavy things from point A to point B over and over again
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@FiveThirtyEight Forget walking/running speed. Just move heavy things from point A to point B over and over again