Fitness trackers were useless

American scientists have found that the advent of wearable fitness devices turned out to be useless and did not have a positive impact on the overall activity of the population. They analyzed data obtained from various sources from residents in eight countries - Canada, the Czech Republic, Denmark, Greece, Japan, Norway, Sweden and the United States. The research was carried out between 1995 and 2017. Despite the popularity of smart devices, the average level of physical activity in recent years has decreased, not increased - smart gadgets have not helped people move more and have not changed their lives.