after a long period of exercise a muscle can cramp
your muscles tighten up
you simply tighten your diafram muscle (tighten your stomach)
When you tighten a muscle, the muscle fibers contract, causing the muscle to shorten. This allows the muscle to generate force and exert tension on the bones, resulting in movement of the body part connected to that muscle. Tightening a muscle can also help stabilize joints and maintain posture.
What happens to the bones when muscle shortening
muscle contraction
When knots tighten when pulled, they become harder to untie and may even become permanent.
Bronchoconstriction or bronchospasm is the medical term that refers to the contraction of the smooth muscle in the walls of the bronchi and bronchioles that tighten and squeeze the airway shut.
When a muscle contracts, it shortens in length.
it doesnt let anything in it
I think stomach exercises will build muscle and tighten existing ones. Once you have tightened your stomach muscles using one routine, change it up a bit and build muscles in another area.
The muscles constrict (tighten) and then relax to help pump the blood.
you have then stretched your tendon / muscle beyond the normal range .