How do we exercise most effectively?
In the book Outlive, Peter Attia breaks down the types and functions of exercise specifically for the goal of extending "healthspan." He identifies three core categories that require simultaneous focus:
1. Aerobic Endurance
The key metric for this ability is $VO_2\text{max}. This refers to the maximum amount of oxygen (in milliliters) an individual can utilize per kilogram of body weight per minute ($ml/kg/min$) during intense exercise. It represents the "ceiling" of how well your heart, lungs, and muscles work together.
Cardiorespiratory fitness is the strongest single physiological predictor of all-cause mortality—its priority is even higher than factors like smoking or diabetes. Different intensities serve different purposes:
Low-Intensity Aerobic (Zone 2): Activities like jogging or brisk walking improve mitochondrial density, metabolic health, and fat oxidation. This is the foundation of metabolic stability, a vital marker of healthy aging.
High-Intensity Interval Training (HIIT): Aiming for over 90% of your $VO_2\text{max}$, these sessions (once or twice a week) significantly boost your peak cardiorespiratory reserve.
2. Resistance Training and Muscle Maintenance
Starting from age 30, humans lose approximately 3% to 8% of their muscle mass every decade.
As we age, low muscle strength isn't just about feeling weak; it drastically increases the risk of death from falls. Over one-third of seniors over 65 die within a year of a hip fracture. However, if you have sufficient strength, your body can "catch itself" or support its own weight during a stumble, preventing catastrophe.
The best time to build muscle is now. Due to cellular aging, the efficiency of building muscle decreases as we get older. Furthermore, muscle size does not equal muscle strength. Your goal should be getting stronger (functional strength) rather than just aesthetic volume. Exercises like weighted hiking or rowing are excellent for building actual power rather than just "show" muscles.
3. Neuromuscular and Balance Training
This is the most frequently overlooked category. While strength helps you recover from a fall, a lack of dynamic balance is often what causes the fall in the first place.
Modern sedentary lifestyles have severely weakened the balance of even young people. You can test this by:
Closing your eyes and lifting your arms (are they at the same height?).
Attempting a "one-legged stand" with eyes closed.
Checking if your shoes wear down unevenly or if you lean to one side during a squat.
Habits like crossing your legs or leaning on one side while standing create "compensatory patterns" where your dominant side takes over and the non-dominant side atrophies. Eventually, your "intended movement" and "actual movement" become mismatched, leading to trips and injuries. Dancing or switching to your non-dominant hand for daily tasks (like opening bottles) are great ways to regain body awareness.
It’s never too late to start!