Exercise (Zone 2 + Resistance)

What it is

A structured combination of:

• Zone 2 (conversational pace, ∼60–70% max HR) — long, easy cardio that improves mitochondrial density and fat oxidation.
• High-intensity intervals — short, hard efforts that drive VO₂max.
• Resistance training — sufficient loading to preserve and grow muscle mass and bone density.
• Stability, balance, and mobility work — especially relevant for falls prevention in older adults.

Why it’s of interest

Cardiorespiratory fitness (VO2max) is among the strongest predictors of all-cause mortality — the gap between “low” and “elite” fitness corresponds to a hazard-ratio difference larger than that of smoking. Muscle mass and grip strength independently predict mortality in older adults. The dose–response is monotonic across nearly all studied ranges.

Mechanisms

• Improves mitochondrial function and biogenesis.
• Reduces systemic inflammation (Chronic inflammation).
• Improves insulin sensitivity and glucose handling.
• Releases myokines with cross-organ effects (BDNF on brain, IL-6 in muscle context).
• Maintains bone density (resistance + impact).

Practical guidelines

• WHO baseline: 150–300 minutes/week moderate aerobic OR 75–150 minutes vigorous, plus at least 2 sessions/week of muscle-strengthening activity on all major muscle groups.
• Most longevity-focused practitioners recommend more — especially resistance training, often 3–4 sessions/week.

Safety

Sudden very-intense exertion carries cardiovascular event risk in deconditioned or undiagnosed individuals. Resistance training has very low injury rates with technique-prioritised loading.

Related entries

See also: VO2max, Mitochondrial dysfunction, Peter Attia.