Fitness professional Juan Carlos Santana shares his thoughts on flexibility in this comprehensive article. JC also discusses the concept of “mostability.” In my experience, extreme flexibility without an appropriate level of strength to control a particular range of motion can leave a person as predisposed to injury risk as a highly inflexible person, perhaps more so. A “tight” person that can move through a “functional” range of motion with control may be OK, as long as any flexibility deficits are bilateral or even. What do I mean by the word “functional” in this context? Basically, the person can move through the ranges of motion associated with their activities of daily living and any recreational and occupational demands.