Keep Your Mental Energy Up to Perform Strong

Mental fatigue increased their perceived effort", otherwise known as the rate of perceived exertion (RPE), or how hard they thought they were working during their run

Trick your mind.

If you still feel like your brain is bringing down your workout, there's no need to succumb to it. Lower your perceived exertion with music (the harder you want to go, the faster the beat should be), self-talk (think in the second-person, so "You can keep going" instead of "I can keep going"), or even just smilin

endurance—"any activity where you need to pace yourself", according to Martin—can require conscious mental effort to decide to keep going. "And because mental fatigue increases perception of effort, this decision gets harder as you go on",