Do you think that sometimes diversifying your goals is more effective then zeroing in on a single one to achieve that goal?

A Harvard influencer I watch online said he went 2 months without exercise because he needed extra time to complete a very difficult set of classes and then he got a disappointing B in the class which made him feel like he failed because he was always one of the smartest students in his Harvard classes.

What I believe, is that sometimes investing in more than one goal makes you better and not worse at singular goals, then the person who only invests their time into a singular goal. That if he had exercised like he always does, he may have gotten an A in the class instead of a B.

I think the studies show that successful, prize-winning authors usually have a side job or full time job they do outside their writing career.

I found when I was in university, if I spent time at bible studies before doing home work, I could finish my home work faster then I did before the bible study and my grades would be higher then they were when I did not go to bible study and just started doing my home work immediately after I left class.

Do you think that sometimes diversifying your goals is more effective then zeroing in on a single one to achieve that goal?
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