Rest Day

Cardiorespiratory Fitness: The Vital Sign That Predicts How Well You’ll Age and How Long You Live

Forget BMI and body weight — cardiorespiratory fitness is one of the most powerful predictors of how long you'll live and how well you'll age. A landmark 2025 review analyzing over 20 million observations found that high fitness reduces mortality risk by 53%, outperforming traditional health markers like blood pressure and cholesterol. Even better: every single improvement in your work capacity matters, and the training you're doing right now is building the kind of fitness that literally extends your life.

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