We tried the science-backed 7-minute fitness routine that's going viral, and it actually works

When we first heard about The 7-Minute Workout, an app that promises to grant you the benefits of a sweaty bike ride and a trip to the gym in just a few minutes, we thought it was all hype. But as it turns out, the app actually, well, works you out. We tried it for the first time in January, and …