Mixed martial arts is as lonely, individualistic a sport as exists. You enter a steel cage, the door gets locked behind you, and all that remains before you is your opponent and the referee. No teammates, no coaches, no trainers. You’re alone.
However, outside of the cage (and in between rounds), a fighter is very much not alone. While the actual competition is individualistic, the preparation for it is very much a team-oriented activity. Behind every fighter is an endless line of coaches, trainers, training partners, nutritionists, therapists, and teammates. Fight teams/camps are very much a big happy family of fighters.