I also get it,can be in my arms,legs and upper body,mostly when I'm relaxing or sit and shut my eyes,actually scares me when I jolt badly xx

Yeah I do every day it is not nice and most of the time it turns into cramp and the muscles are sensitive to touch xx

Be sure you are not dehydrated. My muscles jerk and crawl less when well hydrated.

i get muscle "twitching" randomly about my body, anywhere there is a muscle!! this goes on all day everyday!, also a larger jolt occurs in joints, mainly shoulder/hip/knee, causing the limb (and sometimes whole body) to jump violently. neuro dr was useless, said it was down to stress/anxiety, told me to see psyciatrist! and prescribed betablockers

I get a form of this when I am going to be unable to sleep. They call it restless legs, but it is restless body with me. Everything refuses to settle but just jerks all over.