What is this posterior chain you speak of?

What is this posterior chain you speak of?

The posterior chain consists of a system that comprise all the muscles on your back side. For a quick nerd moment here are some of them:
* Multifidus (spine support)
* Erector Spinae (back and spinal extension)
* Gluteal Muscles (hip extensors, femoral rotation)
* Hamstring Muscles (hip extension, knee flexion)
* Gastrocnemius or Calf (plantar flexes ankle, knee flexion)
* External Obliques (back and spine support, in tandem with anterior core)

Why is this important? A power hip extension helps in just about every athletic movement and any extremely successful athlete most likely has a power hip extension muscle that helps with pushing, pulling, jumping, etc. In CrossFit we work these muscles a lot with all the Olympic lifts, deadlifts, ball slams, rowing and the list goes on.
The problem is that most people sit on their butts and getting to a more anterior tilt with tight hip flexors. This makes your glutes stop working well or not at all and can cause your quads to over work or your lower back to get sore. So safely learning how to deadlift and all the other posterior positions becomes very important to the health and function of your every day movements.