Strava is a social network for athletes that uses satellite navigation to let users keep close track of all their exercise routines, training plans, routes and speed. The app is used by 27 million subscribers from around the world, whose satellite information has been used to create the map between 2015 and September 2017. Sensitive information about secret military bases in key areas of operations, such as Afghanistan, Syria, Iraq and even Area 51, as well as exercise routes, has been leaked online in a detailed data visualization map. The Pentagon approved and encouraged the use of fitness trackers in the US military, distributing 2,500 Fitbits in 2013.”]