Mental fitness
Mental fitness is the ability to respond to life's challenges with a positive rather than a negative mindset.
Mental fitness is a measure of the strength of your positive mental muscles (Sage) versus the negative (Saboteur).
This measure of your Mental Fitness Fitness is called PQ (Positive Intelligence Quotient).
Research with 500,000 participants has shown that PQ is the best predictor of how happy you are and how well you perform in relation to your potential.