Hmmm... well I don't do running. Headbanging / dancing wildly is the closest I get to exercise. I'm less than enthusiastic about the self mutilation too, strangely enough.
Usually at festivals when a band is on one stage, the other stage is preparing for the next band, so there is little or no overlap. Full marks to the organisers for trying to provide as much metal as possible in one day and I do accept maybe having to miss a bit of one set or another. The two headliners though.... There are bound to be loads of people who really want to see both. Do they really have to be on at the same time?