I knew a girl that did something similar in middle school. In 8th grade she decided to join the JV high school track team on a lark (middle schoolers were allowed to compete in high school JV in our school system.) She proceeded to break the state record the first time she threw shot put. She then proceeded to actually learn how to throw, and within the first four meets had smashed the Discus, Javelin, Shot, and Hammer throw records for her age. The coach was so impressed with her (he was a college track star in the same events) that he took her under his wing and started training her in his NEW hobby. The Highland Games.

Needless to say, this was a girl feared by everyone in the school.