one time my hubby ed was in his art class, and they were doing a critique and had hung up all their productions and sat around on tables and chairs and stuff.
when ed sat down, he felt a terrible pain in his glutes. he thought he had torn a muscle. he was a Div I athlete, and ALWAYS tight, and was worried about an injury. so he sat there all class, trying to relax his muscles. biiiig pain in the ass there.
at the end of the class he got up and stretched and then tried a little massage.....and pulled a TACK that he had sat on for an hour and a half out of his ASS!