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Significant injuries at 19 or 20 years old, you can usually trace it back to overuse at 12 and 13 years old. >> a lot of these kids are playing one sport and playing it year round. >> growing up, glavine took a break each season to play hockey. he gave his arm a rest and thinks that may have contributed to his long baseball career and hes hoping these little leaguers catch on. >> dont throw curveballs. dont throw it all. >> yeah. thats not good. >> dr. sanjay gup tax cnn, atlanta. >> catch sanja...