Nothing is comparable to the emotions that they can feel.
My personal opinion about people who participate in extreme sports is that people enjoy doing this because they feel enormous satisfaction that is bigger than the feelings of the possible risk of death. This kind of person acquires, through this practice, a strong spirit of strength and tenacity. I think they pursue a lot of goals in the participation in these sports despite the fact that they put their lives at serious risk. They are trying to do the best with their lives. For them, nothing is comparable to the emotions that they can feel, and it is something that gives them motivation in their lives.