Self efficacy literally changes the way we see the world. There is data that suggests weaker individuals will perceive the slope of a staircase to be STEEPER than those who are stronger/more athletic. When an athlete is in a flow state, a basketball player will say the hoop looks bigger, or a baseball player saying the ball looks larger and easier to hit. When somebody comments on a video and says "my back hurts just watching that," it says so much more about that person than the video.