Here's everything you're doing wrong in your indoor cycling class

Indoor cycling is becoming ubiquitous. SoulCycle has filed to go public and it faces rising competition from rivals like Flywheel and Peloton.

But many indoor-cycling enthusiasts make simple mistakes that can lead to serious injuries.

Getting hurt could keep you off the bike for weeks, says Brittney Ravettine, a physical therapist at New York Sports Med.

We asked Peloton's head coach, Stephen Little, to demonstrate some of the worst postures and positions - and give us some tips on how to prevent injuries to the knees, hips, and back.