There are some who hold the view that at birth, each of us is allotted a finite supply of energy which exercise depletes, thus hastening our demise. An intense regimen like CrossFit, in this paradigm, would hasten a person’s demise.

That’s wrong, of course. Those who remain sedentary their entire lives often have short, miserable ones, while regular exercisers enjoy better health throughout their time on earth. Exercise has real potential to prolong life and compress morbidity. But it is a major stressor that, if applied incorrectly or excessively, can reduce health and overall wellness.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)