i don't know much about this subject, but I don't recall any explicit example in the bible of anyone in the faith physically beating his/her own body, unless it was a simply beating of the chest out of anguish.
does anyone know of a biblical example?
In terms of mortification, the hair shirt was cited in Psalm 35:13.
I Corinthians can be taken as referring to it:
Every man who strives in the games exercises self-control in all things. Now they do it to receive a corruptible crown, but we an incorruptible. 9:26 I therefore run like that, as not uncertainly. I fight like that, as not beating the air, 9:27 but I beat my body and bring it into submission, lest by any means, after I have preached to others, I myself should be rejected.