Excluding burns and radiation, ALL injuries (i.e., strains, tears, breaks and dislocation) come from two factors: FORCE AND STRUCTURAL INTEGRITY. When too much force is applied to a structure that is cannot support, injury and destruction immediately follow, be it a bridge, building, chain, tree, car transmission, a tire or a muscle, tendon, ligament or joint.
EXAMPLE:
Jump off the second step of your back porch at home. The speed of movement you produced when you hit the ground may be 3 Gs (3 times gravity) of force. Now, get a ladder, climb up on your roof, and then jump off. Because of the increased distance of travel, which produces an increased speed of movement has now generated a possible 10 to 20 Gs of impact force when you hit the ground, and I guarantee that something on your body is going to break. Even though your body weight stayed exactly the same in both instances, the SPEED OF MOVEMENT was drastically accelerated which in turn produced an amount of force that the bodily structure could not support and, of course, injury has to be forthcoming.
A boxer knows that the more speed he can put into his punch, the harder the impact will be. So, if your goal is to break boards at your karate class, you must apply as much speed as possible. But, if your goal is to exercise your muscles in the most result-producing and safest way, then ALWAYS MOVE SLOWER! Any personal trainer, so called exercise EXPERT, or sprint coach that advocates fast baluster movement for the purpose of producing muscular size and strength is a FOOL!
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