Flexibility, as noted above, is a general term and one needs to be more specific as to the type of flexibility being discussed. While there are various forms - the basic forms of flexibility are self-myofascial release (applying a 30 second sustained force to be placed upon a tender point in the muscle to create neuro-myofascial inhibition) (1) , static stretching (holding a stretch at end-range or first resistance barrier for 30 seconds), active-isolated stretching (moving into and out of a range of motion and holding the end range no longer than 1-2 seconds), and dynamic stretching (using the strength of a muscle to move a joint through a full range of motion without compensation). For clarification and understanding of NASM's flexibility continuum, the forms of flexibility to be discussed are summarized in Figure 1.
While much of the current research is reserved towards forms of static stretching using an integrated approach, different forms of flexibility can be used to derive added benefit to a training program, regardless of the goal of the program. Each form of flexibility (as listed in Figure 1) has a role in increasing range of motion, helping to prevent injury, and enhancing strength and performance (See Figure 2).
The National Academy of Sports Medicine incorporates flexibility into all integrated training programs and considers flexibility as an overall continuum utilized to improve neuromuscular efficiency (see Figures 2 & 3).
Figure 2
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