I know spanish very well....IF its wrong sorry!!But hope it helps :D
also...Cansados is like more than 1 but for cansada is referring to a female. Casado is a basically like a male and Cansadas is bacically two or more female so its CANDADOS...
I'm not exactly sure if your asking what this means but if you are this means We need a person who has a lot of resistance and who can participate in background races