First off, there's a nice new interview with me over at The Leighgendarium!
I had a nice review of my sci-fi novel The Immortality Game recently that made me think more about how different perceptions can be in different time periods. The reviewer mentioned that it was hard to believe that the character Marcus could manage as much running as he does, given how out of shape he is.
This is a perfectly fair point to make. I did state a number of times throughout the novel that Marcus was overweight, had a belly, and otherwise looked down on himself for being out of shape, and I never did try to explain why this isn't necessarily true from our current perceptions. I wouldn't have explained it, because the book is written from the point of view of the characters, so it is only their own perceptions that come into play.
Have you written stories that used big differences in perception like this?