I am now wondering whether Peisithanatos counted as a Motivational Philosopher:
"MOTIVATIONAL PHILOSOPHER"— Damian Counsell (@DamCou) October 11, 2021
You've Got Respect The Husserl.
There's No Such Word As 'Kant'.
"Vive, Ride, Ama." - Saint Augustine pic.twitter.com/X3nr7mv8gx
One of my Durham contemporaries did write on motivational speaking, but nobody was motivated to measure its impact so, academically speaking, it never happened.