08/11/2026
If you could only track one number for the rest of your life, it should probably not be your weight.
It should be your cardiorespiratory fitness.
Research published in JAMA following more than 120,000 people found that low fitness carried a mortality risk comparable to smoking, diabetes and coronary artery disease.
And unlike most risk factors, this one moves. Fast.
You do not need a lab treadmill to start.
If you can climb four flights of stairs without stopping to breathe, you are in reasonable shape.
If you cannot, that is information worth having and worth acting on.
Twelve weeks of consistent work changes it. Genuinely.
******We strongly recommend and advise that you obtain a comprehensive physical examination and consult with a licensed physician or qualified healthcare provider before beginning any exercise, fitness, or physical activity program.