Ive done that twice

The only way you'll know for sure is to go visit the doc and get it x-rayed If its not endangering any organs though thats about all theyll do for you....
Was it the good ole hooked in sideways smack into the mast? The last time i did it I thought id just been winded and got up and kept going. It wasnt till after a couple more runs that things started to get painful, and I decided it'd be a good idea to head in. 4 or 5 weeks later it was still painful
I wear an impact vest now.
