Muscles groups in the body are layered, overlapping one another, crossing over joints and attaching to bones in an intricate framework enabling all the wonderful movements of the human body. Muscle enlarges with use, increasing in strength and tone. As the belly of the muscle expands and the tendons that attach themselves to their respective bone become stronger (another collagen structure), range of motion in the joints they serve is decreased. With the expanding center of the muscle, the ends or attachments naturally shorten causing a decrease in flexibility. Deep tissue massage is similar to stretching before exercise, encouraging elasticity along the length of the muscle so that strength and mobility remain in balance. As examples, yoga practitioners can be incredibly flexible, but often lack strength. On the contrary, body builders can be very strong, but their rock hard muscles are often locked into a limited range of movement. Swimmers and dancers require both agility and strength and their bodies develop accordingly.
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