In class, our ab-work is mostly about leg raises and crunches, but occasionally, we do pair up, lock legs and do partner sit-ups. And every time we do, I end up with a rug burn-like rash on my tailbone. The funny (as in ironic, not comedic) thing is that I usually don't notice it until after class is done, I've driven home and jumped in the shower - because soapy water on a raw skin is not a pleasant experience, let me tell you.
No one else in the dojo seems to have this issue for some reason. I figured it had something to do with the seam in either my gi bottoms or the bike shorts I wear underneath, but since I had no live person with a similar experience to compare notes with, I couldn't really put my finger on what the issue was.
Until I stumbled across this blurb on All-Karate.com. Sorry to find that others have also had issues with "the wound" but happy to hear they had solutions, too! Misery really does love company, I suppose.
I guess I'll be adding a roll of gaffer's tape to my already over-loaded gear bag...