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People with more knowledge about benefits of physical activity may also exercise more -- ScienceDaily

While the vast majority (99.6%) of participants strongly agreed that physical activity is good for health, most were not aware of all the diseases associated with inactivity. On average, participants correctly identified 13.8 out of 22 diseases associated with a lack of physical activity. Moreover, 55.6% incorrectly answered how much physical activity is needed for health, and 80% of people failed to identify the probabilities of developing diseases without physical activity. A significant association was found between these scores on knowledge of the probabilities of inactivity-related diseases and how active a person was. Future research is needed to determine whether the results hold true equally between men and women, and whether the survey-based data correctly gauges a person's true levels of physical activity.

Fitness tracking drop-outs

In a survey of 6,223 individuals, Endeavor Partners, a research firm, found that more than half who bought a fitness tracker had stopped using it, with one-third abandoning the tracker within six months.