Joy, Efficient Motion and The Spinal Engine
The spinal engine refers to the precise and fascinating mechanics the spine uses to create efficient walking, running & athletic motions.
google-site-verification=rhEAXBDTuQIn0B1iHyAJcGyrk2qaXiXAP97YPIuylnw
36 Page Fully Illustrated Guide to help you get started with Jumping Rope!