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https://getamoveon.ac.uk/blog/do-trackers-make-you-fitter
Do fitness trackers make you fitter? Hype before evidence. www.shutterstock.com David A. Ellis , Lancaster University and Lukasz Piwek , University of Bath Nearly 20 million fitness trackers were sold last year . These digital devices – which track everything from heart-rate to the number of steps y …
