There are two aspects to being competitive; one is to do with sports, and the other is about technical skills. Being able to recollect the moves and apply them when necessary is a critical aspect.
When I was about six, I saw my elder siblings play chess and pestered my mother into teaching me. Very soon, I was beating everyone at home, and they thought it would be good to join a club. So my sister would take me to the Tal chess club on Thursdays and weekends.
Chess as a sport requires a lot of mental stamina, and this is what that makes it different from a physical sport. Chess players have a unique ability of taking in a lot of information and remembering relevant bits. So, memory and mental stamina are the key attributes.
Chess has given me a lot more than I could ask for. I have been able to feel special, travel the world and do what I truly enjoy. Moreover, chess players love being their own boss and hate having to wake up early!