nickname121482 said:dont tell him to do it everyday as if he does it too much he may harden the tissue and stunt his growth. tell him to do it like 10-15 min 3 days a week with a rest day inbetween. you defintely want too avoid overtraining and stunting his growth.
Yes, something happens to our dics as we work them. It definatly becomes tougher to get gains. His natural growth might be lessened by this. I think it is too big a risk. I think he should be discouraged from doing it until he is done growing.