the.com/flagellation
The art of turning a whip into a workout, a punishment, or a sacrament.
means The act of whipping or beating someone or oneself, whether as punishment, religious penance, or chosen ritual.
from From Latin flagellum, a whip, diminutive of flagrum — so literally a little scourge that earned a big reputation.
Medieval movementFlagellants whipped themselves marching against the Black Death.
Self-flagellationNow mostly metaphor for relentless guilt-driven self-criticism.
Biology borrowFlagellum names the whip-like tail propelling sperm and bacteria.