Olympic athletes make huge commitments to their sport. They give most of their valuable time to training or competing. I have not made a commitment at that grand of a scale, but I have made a commitment of my time to a sport.
I play soccer and have made a pretty size able commitment to the sport. I have practice every day from the end of school to 5 o'clock in the afternoon. I have also committed my Friday and Tuesday nights to games, home and away. This takes away valuable homework and free time that I would like to have, but give up because I love soccer. Not only is my weekday time committed, running and practice is encouraged during the weekends and breaks from school.
My commitment is not as intense and severe as that of an Olympic athlete. However, I give a fairly size able commitment of my time especially for a teenager.