We are all called to mortification…often via prayer, fasting etc.
But not all to say using the discipline or other like things. (one ought to seek direction for such)
Lent particularly is a time to work more on mortification and penance…along with prayer etc.
But some --say the canonized have a “particular calling” to more serious forms of such. Hence you find in the lives of the canonized some rather astounding things. Some of them may have in their desire to be holy went too far.
Some things in their lives are “admirable but not to be imitated” --*kids don’t try this at home. *
A very well written article:
holyspiritinteractive.net/columns/guests/michaelgiesler/corporalmortification.asp