Explanation
못 = cannot (circumstance/ability), 안 = don’t (choice).
Examples
비가 와서 운동을 못 해요
bi-ga wa-seo un-dong-eul mot hae-yo
I can't exercise because it’s raining
오늘은 운동을 안 해요
o-neul-eun un-dong-eul an hae-yo
I’m not exercising today (choice)
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