“Mean drunks have a chemical excuse, too.”
I loved the endorphins. Mellowed me right out. Running made me happier, calmer, healthier, more alert, and never caused rage. I really miss it.
Maybe it’s the increase in testosterone that causes the rage. If a person is used to operating on virtually no testosterone, even a minor increase might tip him over the edge.
I enjoyed running when I was doing it, between my 8th and 9th babies. (Never really got going again after the last two kids, especially since my husband broke the treadmill I could use in the house.)
I think one clue to the “rage” is in a subject’s quote, “She interrupted an important training run.” He believes running/racing is important. That attitude about any activity naturally leads to a sense of entitlement and then anger at impediments, no matter how small.