https://www.runnersworld.com/sweat-science/brain-training-boosts-endurance https://www.runnersworld.com/sweat-science/brain-training-bo... It's based on the Br

https://www.runnersworld.com/sweat-science/brain-training-boosts-endurance https://www.runnersworld.com/sweat-science/brain-training-bo... It's based on the Brain Endurance Training (BET), by Samuele Marcora of the university of Kent, who is quoted in the OP's article (for his definition of effort). https://www.kent.ac.uk/sportsciences/people/profiles/marcora-samuele.html https://www.kent.ac.uk/sportsciences/people/profiles/marcora...