Gretchen Reynolds:

In 12 exercises deploying only body weight, a chair and a wall, it fulfills the latest mandates for high-intensity effort, which essentially combines a long run and a visit to the weight room into about seven minutes of steady discomfort — all of it based on science.

7’s the key number here. Think about it. 7-Elevens. 7 dwarves. 7, man, that’s the number. 7 chipmunks twirlin’ on a branch, eatin’ lots of sunflowers on my uncle’s ranch.

I had a pretty good routine going, alternating yoga with weightlifting and treadmill walking, until I had to refrain from it pre- and post-surgery. Maybe I’ll try this thing out as I work my way back to where I left off. It’s science!