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1st. A more dense neuronal motor input,a more number of appendicular muscle mass,for a ameliorated neuronal loss not just in the motor cortex,but in the complete brain,so hippocampu's.
2nd. This previous premise could come from a genetic origin though it could be in a reverse way,because brain works as a unit,like any organ,then a big develoment of a part of the cortex,that which make us a mechanical machine,implies many others have to get involved,producing same degree of stimulation in a supporting and intregrative effort.
3rd. We move for we want,so the will sparks not just an individual part of the brain,but all of the command center itself.
4th. Lean mass preservation acts against its own capillary bed decline and it could has a kind of entanglement distant effect,like or mainly in the brain's,counterbalancing neuronal mass decay.