I honestly wouldnt suggest doing these ever. After a few reps I can just see someone getting tired, pushing it, catching a toe, and going face first into the ground with 155lbs on thier head. Now if you had a vest, or something then I could see doing them safely.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.