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The increase in obesity over the past thirty years has led researchers to investigate the role of social networks as a contributing factor. However, several challenges make it difficult to demonstrate a causal link between friends' physical fitness and own fitness using observational data. This study uses a randomized treatment design and shows that friends' fitness affects own fitness as well as the probability of being classified as unfit. In equilibrium, our estimates imply that eachdoi:10.3386/w16518 fatcat:fopgve4w4vbfbilvtdsrqs34oi