A study shows that  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    activity is 'contagious'  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    of social media. Researchers at the Massachusetts Institute of Technology found that people who post  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    of their exercise  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    on social media sites motivate  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    people to be more active. Researchers tracked the exercise  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    of 1.1 million runners over a five-year  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   . They looked at the runners' social network use, distance, time,  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    and the calories burned. The researchers concluded that sharing exercise  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    on social media can inspire others to exercise more, harder and more  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   . The  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    includes accounts of how reading about a friend's exercise can be  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   . It said: "An additional kilometre run by friends can inspire  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    to run an additional three-tenths of a  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   , and an additional ten minutes run by friends can inspire someone to run  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    minutes longer." Social media improved the performance of  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   , less in  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    runners, and of those who were showing signs of overtaking a friend's performance. A researcher said: "In  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   , if you run more, it is  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three    that you can cause your friends to run  because competitively data details general inspiring kilometre likely more other patterns period physical routines shape slower someone speed study three   ."