9-Part Slide-Board Workout NFL pro Elijah Wilkinson Perfecting body mechanics, improving muscle function, & eliminating dysfunctional activation patterns are all part of movement mastery. Unfortunately, this is oftentimes easier said than done as every individual has a number of unique movement aberrations that he or she struggles with. The 90 Degree Eccentric Isometrics is truly the key for this. However periodically implementing protocols that require even stricter & more precise form can dial