Just like how it is in life, I believe that’s what happens with the body. It’s a like a reflection. Staying still doesn’t necessarily mean you’re healing. Especially physical as you pointed out. I feel it can also be attributed to mental and psychological traumas.
If we are still (resting), I just think we are avoiding the process that comes with the healing. We let our traumas rule our lives and in return, demolish our ability to be better.
But moving (despite how scary and how dangerous it seems) creates the reprieve we look for. We are no longer under the control of our minds (pasts). It is satisfying, really.