its bogus, for a number of reasons, most especially, your failing to specify what exactly takes 10,000 hours, ie what skill, takes that amount of practise and to what level.
only a few have the genetics to be a top level sportsman, it might take a lot of practise to get there or it may not, it doesn't take,10,000 hours to learn to run, or long jump, most people have that skill cracked by the time they are 6 or so, the time spent is building fitness not motor skills, but if you haven't got the genetics, you can spend half a million hours and it will make no difference, you are not going to the Olympics .
motor skills are built and added to as you progress, there is a lot of carry over from one activerty to another, once you have developed balance reactions, hand eye/ foot co ordination and agility, then those can easily be reprogrammed, to another sport, you don't have to go back and start your 10, thousand hours again just to learn karate, all those countless hours i spent playing football as a kid count to my total,, if i can pull a fast moving foot ball out of the air, control it, dodge a,foot up studs out tackle, side step someone else and smash the ball in the back of the net, i can dodge a karate kick, side step and kick him in the knee, its super easy, to apply the already learnt motor patterns,
i was amazed in my last class, to find i was the only one who could run backwards, how do you get to be an,adult and not learn to do that?
Let's take your example, Jobo. You said, "only a few have the genetics to be a top level sportsman, it might take a lot of practise to get there or it may not, it doesn't take,10,000 hours to learn to run, or long jump, most people have that skill cracked by the time they are 6 or so, the time spent is building fitness not motor skills, but if you haven't got the genetics, you can spend half a million hours and it will make no difference, you are not going to the Olympics ."
First, what's this fascination with the Olympics?
The average child learns to walk in the range of 9 to 14 months, and to run after that up to 24 months. Just doing math, 8 hours of waking time per day times 365 days a year = 2,920 total hours.
So, just to put things in perspective, there are 24 hours per day, let's say the child is awake and able to do whatever for 8 of those hours. Whatever = practicing walking and running while they play, follow adults, pester siblings, torture the dog (i.e. whatever). I don't know if you have kids, or nieces/nephews at that age, but they very rarely stop moving around.
So, as you say, if they've got it, meaning running "cracked," though what level of skill you mean by that missed me, by the age of 6, if you only counted from 24 months of age to 72 months (6 years old) that's an available "practice time" of 11,680 hours.
And... I agree with you, some skills do build and cross-over, as you described above with the football example cross-piollinating into sparring low kicks. the "What" the muscle group is "Doing" is very similar, so the coordination pathways have already been learned. So, good on you. I betcha it doesn't help you much with Wushu, though.
I'm not saying that there's something magical about the 10,000 hours threshold. I'm saying that people are always wanting, well almost always, wanting the shortcut to greatness. And, here's another point, Greatness (i.e. mastery) isn't always the level of skill necessary for competence, just go ask guys who have made their living all their lives as apprentice electricians, plumbers, carpenters, pipefitters etc., and never wanted to take the test to go up the chain to journeyman, much less "Master," as that position comes with more money, but more headaches too... and there's something to be said for quality of life.
Likewise, while many, many people have the potential capacity to be very good at something or other (the game of golf is a great example) most don't have the Money with which to pay for the Time to practice to get good enough. Range balls are expensive for a hobby. But, they are comfortable with their 16 handicap, so they just continue to play their sunday round with their buddies and trade the same bet money back and forth. A version of the same thing could be said for tennis. For billiards. FOr darts. Pick something, you'll find that the people who are really, really good have been at it for at least a decade of doing whatever on a regular, ongoing, multiple times per week basis......
*shrug* If you don't want to believe it, that's fine. Just don't get frustrated with me when the magic doesn't happen in the O/P's 3 or 4 years, that's what I'm driving at.