That is, how many times do you need to log data to get hooked and never stop? In the experience of the brilliant Nike+ team, and in the experience of their users, more than 1.2 million runners who have tracked more than 130 million miles, that magic number is five: If someone uploads only a couple of runs to the site, they might just be trying it out. But once they hit five runs, they’re massively more likely to keep running and uploading data. At five runs, they’ve gotten hooked on what their data tells them about themselves.
