In the past, warriors trained to fight by fighting. One may increase are strength by swinging a sword faster. Acceleration requires force. Greater acceleration requires greater force. Therefore, by swinging a weapon faster, the muscles the warrior used to swing the weapon became stronger, even though the weight of the weapon did not increase. To punch or kick faster and stronger, practice punching and kicking faster and faster for many, many repetitions. Muscles can only contract from their attachment points towards the center; they do not contract toward either side. S.A.I.D. works because, although muscles can only do one thing—contract—there are other factors that help determine what the final result of a given muscle’s contraction will be:
Speed of contraction. Strength of assisting, stabilizing and opposing muscles. Length, range of motion and elasticity of assisting, stabilizing, and opposing muscles. Core stability. Stability of our legs. Ability of all of the muscles involved to fire in the proper sequence and with the proper force for the proper length of time Confidence in our ability not to get hurt by being able to stop or reverse the action at the proper time.
In conclusion, to improve the strength and quickness of your punches and kicks, perform the individual punches and kicks faster and faster for many, many repetitions every day. Cross-training may help prevent training boredom and even be a relaxing moment, but it will do little to improve the skills that you need in your martial art.
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