For millions of years, we moved. A lot. 15km per day at least. We exist, because we were able to coordinate complex hand movements with rational thinking while being on our feet! Smart hunting techniques or the ability to build more or less complex shelters alongside movement are just a few examples, proving how much of a survival advamtage it must have been to perform cognitive tasks while moving. This unique ability made us the ultimate predator in the animal kingdom and eventually lead to brain growth in the first place.