You state your belief that kids learn movements by doing. I agree!
But the problem is- THEY AREN'T DOING!
Kids would rather play video games than go out and ride a bike.
Life is full of "winners and losers". It's called natural selection. Whether young people want to believe it or not, they will be faced, at a rather early age, with the results of not being a winner. And in recent generations, I don't see our family units or schools doing anything to prepare them for this fact. Sports and other competitions (the kid who just won the National Spelling Bee comes from a school just down the street from me) DO prepare them for the struggle to excel and succeed!
Could it be that many young people today, act the way they do because they have never been "taught" the tenents of constructive growth through competition? Why do they carry weapons in to schools, with the sole intent of hurting others whom they feel they have been slighted by? Are their psyches so fragile that any negatism will set them off like a firework?
Are we creating generations of young people who now feel that they are "entitled" to anything they want, rather than having to work for it? And that there must be "an easy way" to get it? We've already made it too easy by lowering standards, and because society has become accepting of mediocrity!
We praise those in our society who achieve great things! But we, as a society, do very little to encourage the basic growth which will result in these exceptional successes! It's only because of the high standards within a particular family, or the single exceptional individual who makes this happen for themselves.
I believe that competition at very young ages is inappropriate. Preparation is a basic need prior to competition.
How would you like me to give you a flying exam after only having 5 hrs in the plane?
But at 35-40 hrs, many students are prepared to show their basic skills are solid.
So, let's get the kids playing! Encourage diversity in their participation of various sports. Do not encourage specialization until time constraints, finances, and established personal interest show a positive direction for the young person to follow.