Wonder if anyone else has experienced this, or understands what is going on.
I can get it anytime, usually when I sudden jerk or flex my muscle. I have suffered cramps in my biceps, triceps, calfs, and the side of my torso. The side torso and my calfs are the areas most frequently prone to sudden cramps.
I jog 5-6km everyday, so I initially thought it was due to improper warming up/cooling down. But then I realize it literally can happen anytime ... when i'm asleep (even without AC), during bathing when I suddenly reach for the soap, etc.
The pain is excruciating and lasts for about a minute. It subsides after a few min, but the affected area is very prone to recurring cramps for about an hour after the first one. Thereafter I can use the affected muscle normally again.
Interestingly, I have never cramped up during sex.