The joy of feeling uncomfortable and totally destroyed

"I don't like running. I don't like even doing exercise! But I want to raise money for charity."
David Goggins

David Goggins Runners World

Strengthen Your Mind Like a Navy SEAL | David Goggins

"The most benefit of endurance sport is not a physical one, it is for the spirit."

Just do your very best.

See also:
youtube - Beyond Ability
youtube - What it's like to run 135 miles