Pushing Through

Today I suited up to head out for a quick run before work. Almost immediately I could tell my body was not as up for it. something was off. I know a day off is coming soon, but I was hoping to stay off as long as possible. Today begged the question though, when do you push through. I have heard a variety of theories and it would seem a personal question each person needs to address. So that's my question to each of you, my four readers. When do you push through and when do you acknowledge this isn't the time?