all right, so major league advice for today's little league pitchers. if you want your arm to last, learn the right moves. cnn's chief medical correspondent dr. sanjay gupta explains in today's fit nation segment. >> that's pitching great tom glavine, watching his son's little league practice. you might be surprised that what he has to say. >> i wouldn't let a kid at 11 years old throw a breaking ball. i never threw a breaking ball until i got to high school. >> why does he say that? because the breaking ball, the curveball, puts too much stress on preteen elbows. >> that's a little better. >> over time we have seen an epidemic of overuse injuries in youth baseball, an epidemic of shoulder and elbow injuries. >> that often means surgery and pitching careers over before they even started. >> i think at this young age,