Daily MailFitbit fitness tracker works as middle-aged women does extra HOUR ...Daily MailIn one of the few completed clinical trials of fitness trackers, Dr Lisa Cadmus-Bertram, an assistant professor at the University of Wisconsin-Madison, found that overweight middle-aged and older women who used a Fitbit got about an hour of additional ...Fitness trackers all the rage, but do they help?Boston Globetất cả 17 bài viết »