The plank is probably the single most important exercise. It is fundamental to the push-up, mountain climber, vinaysa yoga, burpie, bear crawl, wheel barrow and so many more. Kim Samborski, a personal trainer for Equinox and POW! MMA felt it was crucial to teach how to do the plank properly. She offers biomechanical tips. These are the type of technical lessons that prevent injuries. Take a look at her explanation. She offers tips on modifing and progressing this fantastic core exercise.