I have a friend who is a spinner. She was tall, graceful, and athletic. Then, she bought a spinning wheel that causes her to hunch over it. Now, a month later, she is in the kind of pain that causes people to wince as they move.
I kind of laughed and chided her, then the other night, I was working with some thin blue yarn in a dimly lit room, and I hunched over toward the light. (My wife was watching a very good movie.) Now, I am in the kind of pain that causes people to wince as they move. It is not bad during the day, but for the first few minutes in the morning, I wince as I move.
It is just a sore muscle from not sitting up straight for a few hours. Proper exercise, stretching, and it will go away in a few days. Still it is embarrassing.