Advice for the mentally suffering - Yer Blues: "Depression, like most mental disorders, is both illness and meta-illness, sickening the body and mind at the same time that it saps the self's capacity to maintain in all respects. It is a bit like AIDS in this formal respect, an assault on the organism's defenses against all kinds of entropy. It wounds and disarms in one stroke.
...
What is it about ping pong tables ...? It is low-maintenance, offers competitive and enjoyable exercise, and unlike billiard balls, its implements cannot cause harm. The perfect pastime for the bored and potentially suicidal (and I mean this quite seriously)."

in der psychiatrischen Einrichtung, in der meine Ex wegen ihrer Depressionen stationär behandelt wurde, gab es tatsächlich eine Tischtennisplatte. Und der Andrang war immer groß.