"Mental exertion" refers to the effort or strain that one puts on their mind or brain when thinking, solving problems, or engaging in mentally challenging activities. Full definition
In kids and teens, cognitive rest may mean limiting, or completely avoiding, activities that require mental exertion. (verywellfamily.com)
This sets up some «interesting» situations for most owners, who quickly find out that the breed requires almost as much mental exertion as physical exertion, or the dog ends up in another home, usually leaving a large swath of destruction in his path. (justweimaraners.com)
With no metaphysics, no magic, no influence from mental exertions like praying, etc. to be seen even at the quantum level, any and all claims to the contrary, including your whiny «oh it might exist» bullshit, require proof to the contrary because the field has already been cleared. (religion.blogs.cnn.com)