Maybe centuries from now we will be able to replace movement with a bunch of chemicals that confuse the muscles to think they moved, but movement actually causes a lot of hydraulic pumping effects throughout the lymphatic system that physically diffuses toxins into a waste stream.
It’s probably not possible from a physics standpoint to replace motion induced pumping/diffusion with pure chemistry.
I suspect the brain alone cannot do it. At a some point the chemistry needs to happen, and it has to be in the right place (so the physics of moving liquids inside your body is also required).
It’s probably not possible from a physics standpoint to replace motion induced pumping/diffusion with pure chemistry.