Who knows where you ran last week? If you're privacy-minded, perhaps just you... and your running app. But our fitness apps often share more information than we realise. The Strava app, and now Polar Flow, have released maps that gave away potentially sensitive military locations.

iOS/Android: When I run, my inner monologue sounds like an argument between a good coach and a bad coach. One voice tells me to take it easy, find my best pace, not to look at my watch, just find the right level of effort. Then the other voice butts in to say something like "Oh, look at you, running so slow, and you're already tired! You suck!"