How does weight lifting stunt the growth of boys?
It doesn't. It's a commonly held myth. Normal, properly
performed resistance exercise will not stunt growth in young
people. Younger individuals should be carefully supervised when
weight lifting, especially when attempting more complicated lifts
with heavier weights. It's possible an injury resulting from
improper use of weights could stunt growth, but it shouldn't be an
issue if proper supervision and training is given.