flagellation

Flagellation (Latin flagellum, "whip"), flogging, whipping or lashing is the act of beating the human body with special implements such as whips, lashes, rods, switches, the cat o' nine tails, the sjambok, the knout, etc. Typically, flogging is imposed on an unwilling subject as a punishment; however, it can also be submitted to willingly, or performed on oneself, in religious or sadomasochistic contexts. https://en.wikipedia.org/wiki/Flagellation