Fit? Fitness? Possibly from “an adversary of equal power”.

Then the question; what is it that we seek out of fitness? Assuming that the notion of fitness comes from fit, and assuming that fit means an adversary of equal power, are we simply training ourselves in order to fight and combat our “adversaries”?

What if you do not see anyone else as your adversary, and also, you don’t see anyone else as having equal power to you?

Then, is the goal to go out and seek ever more powerful adversaries? Maybe.