What causes runner’s high – and how can you boost your chances of an ecstatic 5k?

T he runner’s high, where pavement-pounding drudgery turns into something like a chemically enhanced experience, is an elusive state to pin down. Some people seem to get it during most of their runs; others rarely, or barely at all. A few lucky Couch to 5kers claim to experience it within their firs...

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