A professional swimmer can obtain a lot of prizes and glory when they win in competitions, but when they lose, they may feel disappointed and frustrated. Maybe in just one competition, participating in 5 or more minutes, they have spent a lot of time in training. It is very tiring for such age. On the other hand, they need to keep up with their school work and acadamic results. It would be a hard work for the teenages. Over-excersice will make people tiring, without enough rest, it's hard to concentrate. Sometimes they need to participate in trainings or competitons, causing them need to skips lessons at school and thus are unable to follow up in school. It's really hard to have a balance in both school and swimming.