Longevity IV: Exercise

Exercise is the closest thing we have to a wonder drug, and yet most people get it wrong in predictable ways. I covered the mechanics in an earlier four-part series on exercise, and a year later, my thinking hasn’t really shifted. The way I find it most useful to think about training is through four lenses — strength, cardiovascular, psychological, and social. Each one matters. Most people are heavily underweighted in at least two of them.

The one principle that governs strength and cardiovascular work is progressive overload. The training has to get harder over time. Not faster. Not flashier. Harder. I see patients who have been “exercising” for twenty or thirty years and have done essentially the same thing the entire time — same weights, same routes, same intensities. The result is predictable. They either pick up overuse injuries from a narrow movement pattern repeated indefinitely, or they decline functionally because the stimulus stopped being a stimulus a long time ago. Father Time eventually wins that argument.

I’ve been training consistently for about 25 years, and the honest report is this: it doesn’t get easier. That’s the point. I’m not sore for two weeks after a session anymore, but I’m sore. I’m tired. The day after a hard training day is hard. That’s normal. If your training never produces fatigue, you’re not training — you’re moving.

Less Sedentary Beats Most Optimization

For the majority of people, the simplest intervention is just being less sedentary. 

Patient insight on activity level is roughly as accurate as patient insight on nutrition — which is to say, not at all. People will tell me they’re active and then turn out to average two or three thousand steps a day. That isn’t active. That’s sedentary with extra steps.

Strength standards are equally bleak. A reasonable minimum I’d want to see — bodyweight squat, deadlift, and bench for men; bodyweight squat and deadlift with a 60% bodyweight bench for women — is rarely encountered in my practice. A more useful target for both sexes is something like a 1.5x bodyweight squat, a 2x bodyweight deadlift, and a 1x bodyweight bench. Most people can maintain those numbers well into their seventies if they care to.

Cardiovascular: The Zone 2 Trap

The popularization of zone 2 training has, for many people, come at the expense of intensity. The biggest bottleneck I see in training is time, and when time is limited, intensity is the last thing you want to give up.

The correct answer in cardiovascular fitness is to hit every level of intensity. Most of the volume should be lower intensity. But if you only have 20 minutes a week, that 20 minutes should be hard. As your time budget grows, you add longer, lower-intensity work around the high-intensity core. This is the inverse of what most people end up doing — they hear a podcast about zone 2, drop the hard work, and spend an hour at a pace that doesn’t ask much of them.

For walking and casual movement, the answer is simply: as much as physically possible, and break up sedentary time wherever you can.

The reason intensity matters is that cardiovascular outcomes correlate strongly with metabolic equivalents — METS — which is essentially a measure of how hard you can work. VO₂max is the surrogate marker most people will encounter. The harder your ceiling, the better your outcomes.

Strength: The Mortality Marker

Strength has one of the strongest relationships with all-cause mortality in the entire literature. Resistance training isn’t optional. The same philosophy applies — something beats nothing. Two 15-minute kettlebell sessions a week is meaningfully better than zero. The optimal frequency is two to three full-body sessions per week, with the same focus on progressive overload that applies to cardio.

Some quick benchmarks worth knowing. Men over 40 who can do more than 40 pushups have a substantially lower likelihood of cardiovascular death over the following decade. Men who can’t do 10 are in a higher-risk category. Grip strength shows similar patterns — it’s one of the cleanest, cheapest predictors we have of overall function and mortality.

Social: Calibrate to Your Life

Some people need more social interaction. Others need less. If your days are spent surrounded by people, training alone is a form of active meditation, and you should probably take it. If your days are isolated, group activities become medicine. Pickleball and tennis are great because they bundle cardiovascular work with social contact. Group fitness classes tend to have the same people at the same times, and showing up consistently builds real relationships over months and years.

There’s no universal answer here. Calibrate to what your life actually looks like, not what someone else’s program says.

Have a Plan and Then Stop Thinking About It

Most patients don’t need another thing to think about. They need a recipe — a strength and conditioning program they can show up to and execute without making decisions. Pick a program. Put the sessions on your calendar. Run it for 12 to 16 weeks. Stop deliberating.

Complexity in training does pay a neurocognitive dividend over time. Programs that combine strength, balance, cardiovascular work, and problem-solving tend to produce better cognitive outcomes as people age. But complexity is relative. For one of my patients, walking on uneven ground is a complex movement. For another, it’s active recovery. Calibrate to where you actually are.

Movement is the doctor you want to see daily. Active recovery isn’t just good for the body — it’s restorative psychologically. A walk outside is probably the single best thing you can do for your mind, body, and spirit, and it costs nothing.

The Basic Principles

Have a plan. Strength and cardio both. Follow the plan. Record what you did. Show up consistently until you die.

That’s it. Most people overcomplicate this enormously, and the overcomplication is usually a form of avoidance. The work is simple. The work is also hard. Both of those things are true at the same time.

3-Point Summary

• Progressive overload governs both strength and cardiovascular training — if the work isn’t getting harder over time, it isn’t really working.

• The biggest training error I see is intensity getting sacrificed for volume. When time is limited, hard beats long.

• Strength carries one of the strongest mortality signals in medicine. Two short sessions a week beats zero, and consistency over decades beats optimization.

3 Practical Takeaways

• Pick a program and run it. Don’t design your own. Choose a 12 to 16 week strength and conditioning template, put the sessions on your calendar, and stop deliberating. Decision fatigue kills more training programs than bad programming does.

• Audit your real activity level. Track your steps for a week without changing anything. If you’re under 7,000 a day, you’re sedentary regardless of what you do at the gym. Break up sitting time first; everything else compounds from there.

• Test your strength benchmarks. Find out where you actually stand on a bodyweight squat, deadlift, and bench. If you’re below the minimums, that’s your training priority for the next year. If you’re above, work toward 1.5x squat, 2x deadlift, 1x bench and maintain into your seventies.​​​​​​​​​​​​​​​​