Summary
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Aging is real, but so is our power to shape it.
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Muscle, strength, and VO2 max decide how well we age.
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We can train for our final decade like an athlete.
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Every joyful moment depends on physical and emotional health.
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Start earlyâbecause aging doesnât wait.
About This Post
This post is a distilled reflection of insights from the video âThe Training Principles That Actually Matterâ from The Diary of a CEO. It shares expert advice on how to approach aging with purposeâbuilding muscle, maintaining VO2 max, and training for the final decade of life. Every idea here is drawn directly from that interview.
Facing the Marginal Decade
Aging is something we all know is coming, but few of us really want to face.
Most people donât even realize theyâve entered it until itâs already begun.
But ignoring it doesnât make it go away.
Ignoring it just makes sure weâre less ready when it comes.
âI realized at a funeral: life was still there for them, but joy was gone. They couldnât garden. Couldnât play golf. They retreated from life.â
We have a choice:
The Power of Muscle, Strength, and VO2 Max
Hereâs the truth: thereâs no single measure that predicts your lifespan better than your VO2 max.
No single factor that shapes your last years more than your strength and fitness.
Theyâre your insurance against frailty.
Theyâre what keep you moving, playing, and feeling alive.
âYou can never be too strong or too fitâunless youâre injuring yourself along the way.â
When your body is strong, every other part of life becomes easier.
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These are the things that make life richâeven in the last chapter.
Training for Lifeâs Final Decade
Athletes donât train randomly.
A sprinterâs training looks nothing like a skierâs.
Each has a specific goalâand trains with precision to meet it.
Thatâs what we need to do for our final decade.
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What do I want to be able to do at 80?
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Play soccer with my grandkids?
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Travel with my partner?
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Get up off the floor by myself?
âThe Centenarian Decathlon isnât about winning medalsâitâs about training for the life you want in your final years.â
Everyday Moments and Physical Preparedness
Itâs easy to think of training as something separate from life.
But reallyâitâs for those small, irreplaceable moments.
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Even walking down the stairs on a trip to Bali isnât just a walkâitâs a gift.
But itâs a gift that depends on having eccentric strength to control each step, and endurance to climb back up.
âThe ability to pull yourself back into a raft on a river trip is about more than strength. Itâs about keeping life big and beautiful for as long as you can.â
Why Early Action Matters
The sooner you start, the better.
Strength doesnât build overnightâlike investing, it grows with time.
Itâs tempting to think:
âIâll start training when Iâm older.â
But waiting only makes the climb steeper.
âIâve seen it in 20-somethings alreadyâsigns of decline most people wonât notice until 65. Early action matters.â
The Inescapable DeclineâBut Manageable
No one can stop aging completely.
Itâs inevitable.
But how fast we slide down the slope?
Thatâs up to us.
Studies show that people who trainâwho keep movingâdecline slower.
They hold onto mitochondrial function, muscle mass, and endurance.
They keep playing, laughing, and living.
âYou canât stop the decline, but you can slow itâgiving yourself more years of living, not just surviving.â
Mindset, Motivation, and Emotional Health
This isnât just about the body.
Itâs about the mindâand the heart.
âThe final decade isnât just about lifting weightsâitâs about having the mental and emotional reserves to keep showing up.â