As we are always looking to improve ourselves, we look to those at the top of our profession(s). I love the simple manifesto used by Mike Boyle:
1) First we will do no harm.
2) We will train no further than technical failure.
3) We will deliver the minimal effective dose.
Found at the following link
Also, I resonate with the basis of Gray Cook’s Functional Movement Systems being “Move Well. Move Often.” And, I like to adapt it by adding “Eat Well.” at the front.