How Exercise Shapes You, Far Beyond the Gym
I believe that life is deepened by physical, spiritual, emotional, social, and intellectual stress. Added as a bonus: discovering one's limitations. Doing what we "feel like doing" tends to be a dead end in life, paths of least resistance. Doing what we don't feel like doing can be amazing. A quote:
.. .the author Charles Duhigg, in his 2012 bestseller The Power of Habit, calls exercise a “keystone habit,” or a change in one area life that brings about positive effects in other areas. Duhigg says keystone habits are powerful because “they change our sense of self and our sense of what is possible.”