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How American soldiers are revealing secret information by their workouts

A fitness app that posts a map of its users' activity has unwittingly revealed the locations and habits of military bases and personnel, including those of American forces in Iraq and Syria, security analysts say. The app, Strava, allows millions of users to time and map their workouts and to post them online for friends to see, and it can track their movements at other times. The app is especially popular with young people who are serious about fitness, which describes many service members.

Since November, the company has published a global "heat map" showing the movements of people who have made their posts public. In the last few days, security analysts have started to take note of that data, and some have argued that the map represents a security breach.

Strava "is sitting on a ton of data that most intelligence entities would literally kill to acquire," Jeffrey Lewis of the Middlebury Institute of International Studies at Monterey warned on Twitter. Some analysts have taken to social media to warn that, although the map does not name the people who traced its squiggles and lines, individual users can easily be tracked, by cross-referencing their Strava data with other social media use. That could put individual members of the military at risk, even when they are not in war zones.

The outlines of known military bases around the world are clearly visible on the map, especially in countries like Afghanistan, Iraq and Syria, where few locals own exercise tracking devices. In those places, the heat signatures on American bases are set against vast dark spaces. Tobias Schneider, a security analyst, wrote on Twitter that "known Coalition (i.e. US) bases light up the night."

In Afghanistan, for instance, two of the largest coalition bases in the country — Bagram Airfield and Kandahar Airfield — can easily be picked out. There also appear to be other airstrips and base-like shapes in places where neither the American-led military forces nor the CIA are known to have personnel stations. Perhaps more problematic for the military are the thin lines that appear to connect bases. Those lines seem likely to trace the routes most commonly used by American forces when travelling between locations, and their exposure could leave troops open to attack.

The Pentagon did not directly address whether the heat map had revealed any sensitive location data. The Central Intelligence Agency declined to comment.