If man is meant to be happy, it would be in the evolution--thus one should look there.
What was Caveman meant to do? Live in a cave, of course, swim (we're aquatic mammals), hunt sabretooth tigers,
run from bears, and have little cavemen.
Translating this into real life---
1. live in a stone house that is cold and damp.
2. go to the beach often.
3. chase your cat.
4. go jogging in a dangerous place
5. have little cavemen