How do you cope with the sudden loss of the need to use your body for movement or hunting in the wild? By going to the gym and dedicating time to physical fitness. Isn’t that similar?
I feel the metaphor is more how do you re-learn to stand on your feet and walk after a year in space. You might have to start from scratch, and not even factoring in that neural paths might take longer than muscle fibers to get back to a baseline (mental) fitness.