Rony El-Nashar - Fitness • Longevity • Healthspan

Rony El-Nashar - Fitness • Longevity • Healthspan 50. Helping men and women 40+ look & feel 10 years younger. Science-based strength & longevity.

09/16/2026

Therapy for mind & body

09/15/2026

The goal was never just "eight hours." Inside those hours, the target is around 90 minutes of deep sleep, and that's the part almost nobody measures.

Start with total sleep. Large studies keep landing on about 7 hours as the point of lowest mortality risk, with risk rising on both sides, so longer isn't safer. A dose-response meta-analysis in the Journal of the American Heart Association found the lowest all-cause mortality at roughly 7 hours (Yin et al., 2017), and a UK Biobank analysis of more than 60,000 people found that sleep regularity, consistent bed and wake times, predicted mortality even better than duration did (Windred et al., 2024).

Inside that night, the quality target is around 90 minutes of deep sleep (stage 3, slow-wave sleep), roughly 13 to 23% of an average night. Think of it as the amount to protect and aim for, not a hard number you have to hit.

How to protect it. Keep your total around 7 hours and keep your timing consistent. Inside that, the main lever is body temperature, since you only drop into deep sleep as your core cools, so a cool room (about 65 to 68°F) and a hot bath 60 to 90 minutes before bed both help. Intense exercise earlier that day is one of the most reliable ways to increase deep sleep. And the most underrated factor is alcohol, which sedates you but suppresses deep sleep in the first half of the night, exactly when it should peak, which is why you can sleep 8 hours after drinking and still wake up unrepaired.

Two notes. Wearable "deep sleep" numbers are rough estimates and can be off by a lot, so watch the trend over weeks, not any single night. Deep sleep is one of the few things that measurably supports how your body repairs.

🗣️ Know someone who sleeps 8 hours but is still always exhausted? Send them this.

💬 Comment REVERSAL and I'll send you the free Age Reversal Blueprint. It's a short email series on the handful of levers that actually keep you sharp and strong as you age.

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Sources: Yin et al., Journal of the American Heart Association, 2017 (sleep duration and mortality); Windred et al., SLEEP, 2024 (sleep regularity and mortality); Van Cauter et al., Sleep, 1998 (growth hormone and slow-wave sleep); Fultz et al., Science, 2019 (CSF clearance during sleep); Nature Communications, January 2026 (glymphatic clearance and human sleep); Ohayon et al., Sleep, 2004 (age-related sleep architecture)

09/14/2026

You can hit your daily protein target and still lose muscle, if you're eating it the way most people over 50 do.

The reason is a shift called anabolic resistance. As muscle ages, it responds less to the protein you eat, so it takes a bigger dose in a single meal to trigger the same muscle-building response. A younger body maxes out that response at roughly 20 to 25 grams of protein per meal. An older body needs closer to 35 to 40 grams, or about 0.4 grams per kilo of bodyweight, to get there. The trigger is an amino acid called leucine, which acts like the on-switch for building muscle. Miss the threshold and the switch never flips, no matter how "healthy" the meal was.

Here's why timing beats totals. Most people eat almost no protein at breakfast, a little at lunch, then a big load at dinner. That's one meal out of three actually clearing the bar. You'd build and protect far more muscle spreading the same protein into three solid doses than backloading it all into one.

Two practical notes. Higher-quality, leucine-rich proteins (whey, dairy, eggs, meat, fish) hit the threshold more easily than plant sources, though you can still get there on plants with slightly larger portions. And resistance training re-sensitizes aging muscle to protein, so lifting plus adequate protein per meal works far better than either on its own.

🗣️ Know someone over 50 whose breakfast is basically toast and coffee? Send this to them.

💬Comment REVERSAL and I'll send you the free Age Reversal Blueprint. It's a short email series on the handful of levers that actually keep you strong and capable as you age, minus the supplement-industry noise.

👣 Follow Rony El-Nashar - Fitness • Longevity • Healthspan for more on strength & longevity.

Educational, not medical advice. Talk to your doctor before making big changes to your diet, especially if you have medical issues.

09/13/2026

Here's what you can do 👇

Most people think about staying strong as they get older, and for good reason. Maintaining muscle and strength is a huge part of staying capable. But there’s another quality of physical performance that often gets overlooked: power, which is your ability to produce force quickly.

And this is where things get interesting. Research has found that power can decline substantially faster than strength with age. One classic study of adults aged 65 to 84 found an average decline of about 3.5% per year in muscle power, compared with roughly 1.5% per year in strength.

That difference matters because everyday life isn't just about how much force you can produce. It's also about how quickly you can produce it. Catching yourself when you stumble, getting up quickly, climbing stairs, jumping, changing direction or reacting to something unexpected all require you to produce force fast.

The good news is that power is trainable. And you don't need to become a competitive athlete to work on it. Depending on your ability, that could mean explosive step-ups, medicine-ball throws, faster bodyweight movements, jumps, short sprints or simply performing certain movements with more speed and intent.

That's why I think a good longevity program should train more than just muscle and strength. You want to maintain the ability to produce force, produce it quickly, and actually use it. Because there's a big difference between being strong enough to do something and being able to react when you need to.

The goal isn't just to stay strong as you age. It's to stay powerful enough to move through life with confidence.

Research: Skelton DA, Greig CA, Davies JM, Young A. Strength, power and related functional ability of healthy people aged 65–89 years. Age and Ageing. 1994.

🔁 Share with someone looking to defy aging and turn back their biological clock.

💬 Comment or message me “REVERSAL” for my free Age Reversal Blueprint (a 13-day email series with actionable strategies to look & feel 10 years younger)

👣 Follow Rony El-Nashar - Fitness • Longevity • Healthspan for more on strength & longevity.

This content is for general information only and is not medical advice. It is not a substitute for professional care. Talk to your doctor before making changes to your exercise, diet, or health routine, especially if you have an existing condition.

09/12/2026

Power declines 2x as fast as strength with age👇

Most people think about staying strong as they get older, and for good reason. Maintaining muscle and strength is a huge part of staying capable. But there’s another quality of physical performance that often gets overlooked: power, which is your ability to produce force quickly.

And this is where things get interesting. Research has found that power can decline substantially faster than strength with age. One classic study of adults aged 65 to 84 found an average decline of about 3.5% per year in muscle power, compared with roughly 1.5% per year in strength.

That difference matters because everyday life isn't just about how much force you can produce. It's also about how quickly you can produce it. Catching yourself when you stumble, getting up quickly, climbing stairs, jumping, changing direction or reacting to something unexpected all require you to produce force fast.

The good news is that power is trainable. And you don't need to become a competitive athlete to work on it. Depending on your ability, that could mean explosive step-ups, medicine-ball throws, faster bodyweight movements, jumps, short sprints or simply performing certain movements with more speed and intent.

That's why I think a good longevity program should train more than just muscle and strength. You want to maintain the ability to produce force, produce it quickly, and actually use it.
Because there's a big difference between being strong enough to do something and being able to react when you need to.

The goal isn't just to stay strong as you age. It's to stay powerful enough to move through life with confidence.

Research: Skelton DA, Greig CA, Davies JM, Young A. Strength, power and related functional ability of healthy people aged 65–89 years. Age and Ageing. 1994.

🔁 Share with someone looking to defy aging and turn back their biological clock.

💬 Comment or message me “REVERSAL” for my free Age Reversal Blueprint (a 13-day email series with actionable strategies to look & feel 10 years younger)

👣 Follow Rony El-Nashar - Fitness • Longevity • Healthspan for more on strength & longevity.

This content is for general information only and is not medical advice. It is not a substitute for professional care. Talk to your doctor before making changes to your exercise, diet, or health routine, especially if you have an existing condition.

09/11/2026

The 5× finding wasn’t even the most interesting part. 👇

A Cleveland Clinic study looked at 122,007 adults who had treadmill fitness tests and followed them for about 8 years. The researchers divided them into five groups based on how fit they were compared with other people their age and s*x, from the least fit to the most fit.

The difference between the extremes was striking. People in the least-fit group had about 5 times the risk of death compared with those in the fittest group.

But what really caught my attention was what happened at the other end of the scale. The researchers had a separate “elite” category for people in roughly the top 2% of fitness for their age and s*x. Even compared with people who were already in the high-fitness group, the elite group had a 23% lower risk of death.

So this wasn't simply a case of “being fit is better than being unfit.” The relationship continued as fitness increased, with no obvious point where the benefit simply stopped. The same advantage was also seen in people aged 70 and older.

That's pretty interesting when you think about what fitness means for longevity. We tend to focus on things like body fat, muscle and overall weight as we get older. But cardiovascular fitness is another piece of the puzzle. It determines how much physical capacity you have in reserve, and that becomes increasingly important as you get older.

You don't need to train like an elite athlete to benefit. Walking more, increasing your pace, adding some hills or intervals, running, cycling or swimming can all improve your cardiovascular fitness. The important thing is to keep challenging the system rather than allowing your capacity to gradually disappear with age.

The goal isn't just to live longer. It's to still have the physical capacity to enjoy those extra years.

🗣️ Share this with someone who needs to know.

💬 Comment REVERSAL and I'll send you my free Age Reversal Blueprint. It’s my exact science-based longevity protocol to help you look and feel 10 years younger.

👣 Follow for more on fitness & longevity.



This content is for general information only and is not medical advice. It is not a substitute for professional care. Talk to your doctor before making changes to your exercise, diet, or health routine, especially if you have an existing condition.

Study: Mandsager K, Harb S, Cremer P, et al. Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing. JAMA Network Open, 2018.�https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2707428

09/06/2026

There's an amount of strength training that maxes out how long you'll live, and past it, more lifting does nothing. Most people guess way too high.

The number comes from a Harvard study published this year in the British Journal of Sports Medicine. Researchers tracked 147,374 adults, average age 54, across three decades. The finding: about 90 to 120 minutes of strength training a week was the sweet spot, tied to a 13% lower risk of dying from any cause. Push past two hours a week and the longevity benefit stopped climbing. There's a ceiling, and it's lower than the fitness world implies.

The cause-specific numbers are where it gets striking. That same dose tracked with a 19% lower risk of dying from cardiovascular disease and a 27% lower risk of dying from neurological disease, including dementia and Parkinson's. Lifting isn't just for muscle. It behaves like insurance for your heart and your brain.

Two things the headline skips. The biggest effect came from pairing the strength work with regular cardio, roughly 150 minutes a week, not from either alone. And 79% of the people studied were women, so this isn't a men-only finding, it's arguably more relevant to women, who lose bone and muscle faster after menopause.

Worth knowing this is observational, so it shows a strong association, not ironclad proof. But it lines up with decades of other research pointing the same direction.

Study: Zhang Y, et al. British Journal of Sports Medicine, 2026. Harvard summary: https://hsph.harvard.edu/news/moderate-amount-of-strength-training-each-week-could-boost-longevity/

🗣️ Know someone who skips lifting because they think it takes hours a day? Send them this.

💬 Comment REVERSAL and I'll send you the free Age Reversal Blueprint. It's a short email series on the handful of levers that keep your body strong and energetic as you age, minus all the noise.

👣 Follow Rony El-Nashar - Fitness • Longevity • Healthspanfor more on strength & longevity.

Educational, not medical advice. Talk to your doctor before starting a new exercise program.

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