What Exercise Scientists Say Is the Best Workout for Longevity

What Exercise Scientists Say About the Best Workout for Health

Exercise scientists — those who study the physiology of physical activity for a living — have remarkably consistent views on what constitutes the most impactful exercise programme for health and longevity. The consensus cuts through the confusion of fitness marketing to a clear, evidence-grounded message: the combination of regular aerobic exercise and resistance training, performed consistently over years and decades, produces the greatest health and longevity benefits of any lifestyle intervention known to science. For the full context on exercise and healthy aging, see our guide to exercise for healthy aging.

What the Evidence Points To

Cardiorespiratory Fitness Is King

Exercise scientists consistently cite cardiorespiratory fitness — measured by VO2 max — as the single most important health metric. Studies show that moving from low to moderate fitness reduces all-cause mortality risk by approximately 50% — a larger benefit than quitting smoking, controlling blood pressure, or normalising blood sugar. Peter Attia, physician and longevity expert, calls VO2 max “the most powerful marker for longevity we have.” The practical implication: regular aerobic exercise that genuinely challenges the cardiovascular system is non-negotiable for longevity. See our guide to VO2 max and longevity.

Resistance Training Is Non-Negotiable From Midlife

Exercise scientists are increasingly vocal about the critical importance of resistance training from midlife onward. Muscle is not merely aesthetic — it is metabolically active tissue that regulates insulin sensitivity, supports bone density, provides hormonal signals that benefit the brain, and is the primary determinant of functional independence in later life. The consensus recommendation: 2–3 sessions per week of progressive resistance training targeting all major muscle groups, with emphasis on both strength and power (the ability to generate force quickly, which declines faster than strength with age and is more directly related to fall prevention).

Zone 2 Is the Foundation

Exercise scientists specialising in longevity — including Inigo San Millan at the University of Colorado, whose work with elite athletes has influenced longevity-focused training — emphasise that the majority of aerobic training for health should be at low to moderate intensity (Zone 2): sustainable aerobic effort where you can hold a conversation but are genuinely working. This intensity develops mitochondrial density, metabolic efficiency, and fat oxidation capacity — the foundations of cardiovascular health and longevity — while being sustainable for the volume and consistency required for meaningful benefit.

Common Expert Workout Habits

Exercise scientists typically walk or cycle for low-intensity aerobic work daily (often as transportation or leisure rather than structured “workouts”), do 2–3 dedicated resistance training sessions per week, include 1–2 higher-intensity aerobic sessions per week (intervals or tempo work), and incorporate incidental movement throughout the day (standing, walking, taking stairs). They are consistent over years and decades rather than intense over short bursts. They view rest and recovery — including sleep — as integral components of their training rather than lost workout time.

What Exercise Scientists Avoid

Exercise scientists are generally sceptical of the idea that very high training volumes (marathon running every week, daily HIIT) are optimal for longevity — there is evidence of J-shaped curves in the relationship between exercise dose and certain health outcomes, with very high volumes showing diminishing returns and potentially adverse effects on heart rhythm in some people. They also consistently emphasise that sitting for extended periods is harmful even in people who exercise — the health risks of prolonged sitting are only partially mitigated by structured exercise. Breaking up sedentary time with regular movement throughout the day is recommended independently of formal exercise sessions.

FAQ

What do exercise scientists recommend for health?
A combination of regular aerobic exercise (including Zone 2 work and some higher intensity), progressive resistance training 2–3x per week, daily movement, and avoiding prolonged sitting.

Is cardio or strength training better for longevity?
Both are essential and complementary — they address different aspects of aging biology. Cardiorespiratory fitness most strongly predicts mortality; muscle strength most strongly predicts functional independence and metabolic health.

How much exercise is enough for health?
At minimum: 150 minutes of moderate aerobic activity plus 2 resistance training sessions per week. More produces additional benefit, with the greatest gains from increasing from sedentary to moderately active.

Is too much exercise bad for you?
Very high volumes (10+ hours/week of intense training consistently for years) may be associated with some cardiac changes in a minority of people. For most people, the risk of doing too little exercise far exceeds the risk of doing too much.

What is the best exercise for someone who hates working out?
Walking is the most evidence-backed accessible exercise, with consistent associations with reduced all-cause mortality. Finding physical activity you genuinely enjoy — swimming, dancing, cycling, gardening — produces better long-term adherence than any specific “optimal” exercise programme.