The statement "The story "Getting Some Physical Activity" has the step "i collapsed due to over exertion"" is true because Guessing, because I have not read this story, I would say that the being who collapsed due to over exertion did so while in the process of Getting Some Physical Activity."  In other words, that person got TOO MUCH physical activity or over-exerted him[her]self so that s/he collapsed or fell down exhausted from the experience.