Do you believe hard work is all you need if you're a non disabled person?

My dad knows a guy who got an MBA in his 50s and later managed a hedge fund with 200 managers working under him in China. The guy in his 60s or 70s decides to climb the Grand Canyon with his wife, they started from the bottom and spent 8-14 hours mountain climbing up hill in one day. I'm not even sure I can do more than 2 hours uphill and I'm in my 30s. I think that crazy work ethic is how he managed to earn so much money, my dad says the guy has a genius IQ but this guy isn't just smart, he also works very very hard.

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Do you believe hard work is all you need if you're a non disabled person?
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