One Minute

I think we can all agree that one minute is always equal to 60 seconds. But why is it that 60 seconds doesn't always go by at the same speed. For instance, when I am running full speed (a whopping 10min mile) ONE WHOLE minute seems like 2 lifetimes. Yet, when I am sitting on my sofa with a glass of wine watching Gossip Girl, 60 whole minutes goes by in a blink of an eye.