The Physics of This Fun Chair-Lift Trick: Why Some People Can’t Do It.

Photo: Rhett Allain. Trying to stand up while holding a chair.

Here’s the challenge. Start facing a wall while standing as close as possible. Now take two foot-sized steps back and put your feet together. Lean over so that your head rests against the wall (but keep your feet stationary). Next, pick up a chair and hold it near your chest. Ready? OK, stand up without moving your feet.