"mental rigor" is a correct and usable phrase in written English.
It can be used to describe the mental effort or energy needed to complete a task, exercise mental discipline, or think critically. For example, "He was determined to finish the assignment with the same mental rigor he applied to his other tasks."
Gus demands, and gets, respect from his family; there's much to admire in his mental rigor and in his passion for justice.
In this setting, determining when a young athlete is ready to return to a contact sport, or to school for the mental rigor of regular class work, becomes a highly nuanced, open-ended calculation.
So, playing Starcraft 2 with its mental rigor helps keep your brain fit, and perhaps tunes it up a bit.
The mental rigor required of social dancing can also "make you smarter," according to Richard Powers, a member of Stanford University's dance faculty.
Their focus is on the race and preparing for the physical and mental rigors of competition.
Strahan, in contrast to his friend Brett Favre, the Jets' new quarterback, said he did not want to go through the physical and mental rigors of another season.
Though sexual fantasies lure people here, what keeps them coming back may be the site's constant activity, where things like messaging, searching, and taking photos can turn one hour into five, and like gaming, drugs, and social media offer mental relief from the rigors of everyday life.
New or worsening fever, rigors, altered mental state, general malaise, or lethargy without other identified causes were identified as possible signs and symptoms.
He was attracted to the Gestalt school of psychology, which takes a complex, holistic view of mental processes but lacks the scientific rigor of what became cognitive psychology.
The same rings true for preparing your mental body safely for the emotional rigors that so often accompany the divorce process.
The clinical judgment was based on the patient history with special reference to sudden onset of fever, rigors, gastrointestinal symptoms, tachypnea, mental confusion, pain out of proportion, and muscle weakness.
