Quickness involves the cognitive ability to rapidly relay between the mind and muscles to "go". To be honest, not every athlete has this ability. Some athletes might be fast, but they aren't quick. We can work on this ability through different types of training involving nervous system "twitchiness", which is awesome because this is a vital element of sports. Athlete who are quick off a reaction and can explode without any delay between external cue and action are going to excel. Make sure you get the right type of training, and you'll see the difference.
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