Well, this is definitely an interesting conversation.
When I first read the article, my thought was this...most baseball players work very hard on throwing and hitting, unlike what the Wisconsin coach was referring to in basketball.
What I tend to believe (at least for my kid), is that there is an absence in desire to the physical fitness part. At least from what I am reading, a lot of that is based on his age/grade and he will turn that corner as he matures.
The one thing I have tried to commit to is to not push my son too much as it is his dream, not mine. I just so happen to be passionate about his favorite sport. With that said, I did design a 40 minute workout for him to do 3x per week (sprints, jumps, squats w/o weight, planks, etc.).
I also know the reality is he doesn't do it 3x per week and he cuts corners on it whenever he does do it..more like 2x per week. He does it before I get home from work and I ask him about it, but don't enforce it, though I do comment, or to be truthful, lay a bit of a guilt trip on him when he chooses to do nothing, but I am trying to be better about it...just a little frustrating at times.
One thing I learned from all of your comments is to be patient!!