If you want to overcome more challenges, achieve more success, experience more happiness and less stress — it takes mental strength. After spending decades studying mental strength and interviewing and surveying thousands of people for my recent book, "The Mentally Strong Leader," I have good news. If you always do these eight things, you're already mentally stronger than most. — you can look to this list as a mini-playbook that will help you level up your mental strength. The mentally strong have found the right middle ground between overconfident and paralyzed by fear of failure.

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Persons: you've, I've, grindfulness