There are some situations that call for good sheer physical fitness. For example outpacing the storm that is closing in on you (it happened to me on one of my runs and it was quite a motivation). Or gathering enough wood for a big warm fire when you are tired after a hard slog in a deep snow. Various situations that involve long distance swimming. Or fast short distance swim as a way to rescue yourself from the rapids. Climbing a tree because a bear is chasing you (there is even thread about this real situation here). Etc.