Muscles in the body rarely (if ever) work individually. When one muscle shortens, the opposing muscle has to lengthen. When a muscle contracts, it typically tugs on a bone, which has an effect on all the other muscles attached to that bone. Additionally, the muscles are interlaced and connected with fascia. Fascia is a densely woven structure that covers and interpenetrates all structures of the body (nerves, blood vessels, bone, muscles, and internal organs). There are four