I was a sports writer for 10 years and covered professional football for three seasons. A few things:
1) You have to be a good writer, even if you just want to appear on air. Not an OK writer. A good writer. Make sure you're checking for spelling mistakes (I see one in the question) and always check your grammar. Generic delivery on air and boring writeups will not help you stand out. You have to be different and do the job well.
2) You have to be flexible, both in availability and competence. You have to be able to cover major sports and minor ones, including those you see represented at the Olympics. This is a huge issue with young writers and talent, who are only aware of or interested in one sport like football, for example.
3) You need to be resourceful and be able to build relationships. A large part of the job is just talking to people and asking them questions that resonate. Those are skills that are honed over time. But it starts with being comfortable talking with others and knowing how to navigate sports organizations and representatives for sports figures.