One kind of group therapy, i.e. psychodrama, incorporates the idea that trauma is stored within the body. Psychodrama combines intuitive/improvised theatre with psychotherapy, and favors acting (=letting the body speak) above talking.
I participated in one weekend workshop, and my skepticism quickly dissipated when I re-enacted my issue at the time. I re-lived the issue but found myself in a supportive environment that assisted in genuinely feeling and taking the time to let my body heal.
There's still lots more out there to discover about our body and mind, I'd say!