https://qz.com/quartzy/1595689/how-to-beat-a-marathon-training-addiction/By Andrew Wood & Martin J Turner - April 15, 2019
Running three times a week has become ten times a week, and when life gets in the way of his running, Alex becomes irritable and racked with guilt. He has gone from what was a healthy pursuit, to an unhealthy overindulgence. His body is shot to pieces and is mentally and physically exhausted. But still, he keeps running.
The physical and mental benefits of running are indisputable. But runners can have too much of a good thing.
(excerpt)