Yep Ive done something similar and it seems to help mentally.

Although i do take a slightly different approach my mantra is “hit me harder”. She doesnt really maybe a little but it has the same effect of repeating some sort of mantra.

I once had a mistress i had a very good connection with and i used the line “if you cant hit me harder than that i want my money back”. Obviously i was joking and use that line at your own risk. But she wasn't expecting it and got a good laugh out of it. She also obliged the request (to hit me harder).

the mantra helps me out and makes it fun.