Bright Line.

     I learned a new term today....."bright-line rule." I think this is what successful people have in place in their lives.  Do you have any bright- line rules that you follow?  I think they work beyond will-power, beyond habit. It is a personal line that you won't cross.

A bright-line rule (or bright-line test) is a clearly defined rule or standard, composed of objective factors, which leaves little or no room for varying interpretation. The purpose of a bright-line rule is to produce predictable and consistent results in its application. The term "bright-line" in this sense generally occurs in a legal context.
     

     Here is a great article on research which shows how exercise, or lack of it, effects aging muscles. Reading it might get you to put a new bright-line rule in place.
http://www.runnersworld.com/health/heres-exactly-how-exercise-or-lack-of-it-affects-aging-muscles-this-just-might-change-your