I'm guessing this is actually looking at the wrong thing. If you've ever headed a ball in practice, you don't think it's dangerous to head the ball. If you do i

I'm guessing this is actually looking at the wrong thing. If you've ever headed a ball in practice, you don't think it's dangerous to head the ball. If you do it right, it barely feels like anything. But if you are trying to maneuver your head to a position where you can head the ball, you sometimes find the danger is actually other people's heads. If you've ever knocked heads with someone, you might suspect it is not healthy.