It hurts, but more like surface pain because there are less nerves in the fat that makes up
the boob core. The nails and stretching only set off the nerves in the skin and nipple. That
hurts plenty, but not as bad as other techniques. Getting punched, kicked, etc., if the wrong
spot is hit can be deeply painful in a crushing sort of way. I think most are like me and can
handle some surface pain, but will wince, cover and pull back from a solid crushing shot.