Good humor isn't a trait of character it is an art which requires practice.
Nature is at work. Character and destiny are her handiwork. She gives us love...
Humor results when society says you can't scratch certain things in public...
I think if you exercise your state of mind - my state of mind - is usually more at ease ready for more mental challenges. Once I get the physical stuff out of the way it always seems like I have more calmness and better self-esteem.