Grip strength is a powerful predictor of longevity, linked to lower risks of cancer, heart disease, and all-cause mortality. Jain discusses Goodhart's Law and suggests a holistic approach to health, incorporating compound weightlifting, cardio, mobility exercises, and other health measures like waist-to-hip ratio, HbA1c, and lipids. The key takeaway is that grip strength is a side effect of a healthy, active lifestyle, not the cause of longevity.

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