I tend to agree with that, especially with regards to Grasso's methods which involve mastering specific skills that improve coordination, spacial awareness, and balance before starting on strength and specificity.
There are some differences though... Children don't have mature nervous systems, so it is probably more important to really take time mastering foundational stuff (years).
At this point every trainer in my facility uses this method though, blocking out their client's programs in four month increments. More importantly, they don't get in a hurry to make progress at the expense of the long term success of the client. Communication is HUGE using this method though. Clients can be impatient, and like most of the population, they equate being tired at the end of the workout with a successful workout.
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