too many times to count...
It happened a lot in my early tae kwon do training, it was hard core and no pads. Sometimes worse than others, rarely full on. Like any pain, conditioning is part of learning how it works.
I learned you have a few seconds until the pain really swells up, and the SOB is usually fat and happy they just scored and are waiting for you to go green faced. You have a window to attack to surprise them, and then a little window while they try to figure out how they just kicked you in the balls and you didn't go down, to gather yourself. Its just instinct to drop to your knees, but unless you've been properly racked, its just pain, not injury.
Worst, by far and without equal was running down a guy setting up a cross in Soccer and catching a full cross field tee off from about 2 metres square in the wedding tackle. When I put my hand down to check, I expected to pull back blood....
Guangzhou Pak Mei Kung Fu School, Sydney Australia,
Sifu Leung, Yuk Seng
Established 1989, Glebe Australia