@Linkat,
It's really not all that new. I looked into it some years ago. I decided
not to go with it for three reasons.
* You need to already be at a reasonable level of conditioning and
some of the kids on my team were decidedly not.
* The exercises involve a quick and sudden burst that I didn't think
would be good for young, pre-adolescent bones.
* Every thing I read stressed having a trainer who knew what he/she
was doing and that did not describe me.
That's as I remember it. Things may have changed.