In basketball, I believe this. A lot of young players don't think much about strength or flexibility training. They just play ball. It's not like football where you're trying to move a human being or baseball where you're trying to muscle a ball with a bat. So, they don't think about it much.
However, in other sports? There's so much of that. I don't buy that as an occurrence in baseball. Especially nowadays, there's so much attention to it. Especially when it comes to the throwing arm.