Ready to walk like a professional model? It all starts with having perfect posture. Seeing the pros do it throughout fashion week, we decided to chat with a certified posture expert to learn what it takes to sit up stright with the best of them. Read Part One here.

Check out what Dr. Kenneth Hansraj, spine specialist and author of Keys to an Amazing Life: Secrets of the Cervical Spine, had to share with us:

Muscles adapt to a sloucher's round-shouldered position, resulting in chest muscles that are short and tight, and back muscles that are stretched and weak. This could result in an irreversible "hunch back" along with other serious health problems.

Read Part Three tomorrow, where Dr. Hanraj gives tips on how to improve posture to get your own spine runway ready.