Aloha DavidStone,
It's always great to do a "search The Forum" on your question topic before posting. Chances are, it has been answered, or at the very least, you stumble upon some other interesting information and insight.
Search the Forum
choose advanced
choose Spring Forest Forum
type in your keyword (Spontaneous in this case)
choose in the last 4 years
See what pops up.
When qi moves through blockages, you can get seemingly random movements. Those are all apart of the process - a "pushed" effect and now your back is more flexible. A shake in the shoulder and now you arm hangs correctly, etc.
If it's a bit much, you can thank it, and ask that it be just a little less pronounced, and bring your focus back to your exercise's movement, visualization, and breath.
Much Love,
Shawn
