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The purpose of functional training is not to put someone in an unstable environment and pretend that it is the same environment that they will encounter in a sporting event. Some of the purposes are to increase muscle balance at joints (therefore decreasing the risk of injury), allow for movements to be made using the whole bodies muscular system (including abs, stabilizer muscles, lower back, and antogonists), and prepare someone for what they may experience when trying to recruit their whole bodies power not just that of their chest, back, or legs individually. In most sports participants need to use all of these muscle groups in conjunction, but with classical weight training someone only learns to use one set of muscles at a time. It is not a matter of sport specificity, it is a matter of using the body as a single unit, not the just the sum of many different muscle groups.
There will be cases where functional training is not appropriate, one such case is bodybuilding where the only goal is hypertrophy. The only help that functional training could give to a bodybuilder would be to help to prevent injuries if it is used at the very begining of a training cycle. However, the idea that functional training is only designed for unstable environments is not true, as a person progesses through the phases there is the initial stages of balance and stability, then a movement into hypertrophy and growth training, and finally power training and plyometrics. and if you really believe that plyos does not work to increase speed and the height a person can just then I ask you why has accelleration training and jump training that incorporates plyos had such great success (not just with its students but also finacially)?
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