Doing BJJ, practicing arm bars, (you are mounted, you spin around to the other side, grab arm, pull) my left leg got messed up in one of the spins (this was about half a year ago) so I stopped training to let it heal.
Well today I went back, and when I stretched my left leg fully out to the side, my thigh muscle cramped up bad.
If I lift my left knee, and move it all the way to my left side, then place it down (like a leg block), it does two very little pops.
I'm heading to a doctor and chiropractor tomorrow.
"always paddle your own canoe." - Cord