The Beach Body Is a Terrible Retirement Plan

Why the smartest fitness goal you can set today is carrying your own groceries at 90

Picture two people at 72. The first spent decades chasing the mirror: crash diets every spring, ab circuits before every vacation, and a body that honestly looked great in a swimsuit at 45. The second never had a six pack, but somewhere along the way they started lifting heavy things, walking briskly up hills, and getting down on the floor and back up without making a big deal of it.

Now picture them both trying to climb out of a low beach chair. One stands up in a single easy motion and heads for the water. The other plants both hands, rocks back and forth a couple of times, and quietly asks for a hand. That's the moment the scoreboard flips, and it usually happens long after anyone stopped paying attention to who had the better abs.

Here's what I wish more of the fitness industry would admit out loud. Much of what we've been sold as "fitness" was built for a version of you that only needed to look good a few weeks a year. Almost none of it was built for the version of you who wants to live in your own home, keep traveling, and get down on the floor with the grandkids at 90. That's the shift I want to talk about.

The longevity economy (and why I'm a little suspicious of it)

Joseph Coughlin, who founded MIT's AgeLab, popularized the phrase "the longevity economy" to describe the huge and fast-growing market built around people living longer than any generation before them (Coughlin, 2017). His point was that older adults aren't an afterthought; they're one of the most powerful economic forces on the planet. He's right, and believe me, the market has noticed.

Scroll any wellness feed for thirty seconds and you'll see it: supplements promising younger cells, cold plunges, red light panels, blood tests with fifty biomarkers, and "anti-aging" stamped on just about everything. Some of it has merit. A lot of it is expensive noise dressed up in a lab coat.

So, here's my slightly contrarian take. You can't really buy longevity; you have to build it. And the most valuable thing you can build doesn't come in a bottle. It's muscle, it's power, and it's the plain old ability to move your own body through the world. The good news is that it's cheap. The less fun news is that it takes work, and nobody can do the reps for you.

The decade nobody plans for

There's one number I want you to keep in your back pocket. Researchers at the Mayo Clinic compared how long people live (lifespan) with how long they live in good health (healthspan) across 183 countries. Worldwide, the gap averaged about 9.6 years. In the United States it was 12.4 years, the largest of any country they studied (Garmany & Terzic, 2024).

Think about what that actually means. On average, Americans spend more than a decade of their lives living with disease or disability. That's not a statistic about dying; it's a statistic about how you'll live. It's the difference between driving yourself to dinner and waiting for a ride, between your own house and assisted living, between being the helper and being the one who needs help.

Most of us will plan our retirement savings down to the last dollar. We'll meet with advisors, run projections, and rebalance every year. And yet almost nobody sits down and plans their retirement body, even though it's the one thing that decides whether we get to enjoy the money.

What we actually lose (hint: it isn't our abs)

Most people know we lose muscle as we get older. Doctors call it sarcopenia, and it quietly chips away at us year after year starting in middle age. What surprises people is that strength tends to fade faster than muscle size does, which means you can look about the same in the mirror while your body is getting meaningfully weaker underneath (Mitchell et al., 2012).

But the thing that fades fastest of all is something called power, and it's worth understanding the difference. Strength is how much force you can produce. Power is how quickly you can produce it. Think of strength as the size of a car's engine and power as how fast that engine can get you up to speed. When you catch your toe on a curb, a big engine doesn't help much if you can't get your foot out in front of you in a split second.

In a classic study comparing healthy adults across the 65 to 89 age range, strength was about 1 to 2 percent lower for each additional year of age, while leg power was roughly 3.5 percent lower per year (Skelton et al., 1994). Later work confirmed that power, more than raw strength, is what predicts whether older adults can climb stairs, get out of a chair, and stay on their feet (Reid & Fielding, 2012).

And staying on your feet matters more than most people realize. In the United States, more than one in four adults over 65 reports a fall each year, and falls are the leading cause of injury death in that age group (Kakara et al., 2023). So the real enemy isn't the softness around your middle. It's the slow, invisible loss of speed and force that turns an ordinary stumble into a broken hip.

Your strength is a vital sign

If you wanted to guess how someone is going to age, you could check their blood pressure. Or, honestly, you could just shake their hand. In a study of nearly 140,000 adults across 17 countries, every 5 kilogram drop in grip strength (about 11 pounds) was tied to a 16 percent higher risk of dying from any cause, and grip strength turned out to be a stronger predictor than systolic blood pressure (Leong et al., 2015).

Grip isn't magic, of course; it's more like a window into the rest of the house. A strong grip usually means a body that's still producing force everywhere else. Cardio fitness tells the same story. In a study of more than 120,000 adults who took treadmill tests at the Cleveland Clinic, the least fit had roughly five times the risk of death of the most fit. Even the gap between below average and above average fitness carried a risk similar to smoking, and the researchers couldn't find a point where being fitter stopped helping (Mandsager et al., 2018).

My favorite test is one you can try in your living room tonight. Researchers in Brazil asked about 2,000 adults between 51 and 80 to sit down on the floor and stand back up using as little help as possible. The people who needed the most support (hands, knees, furniture) had about five to six times the risk of death over the following years compared to the people who popped right up (Brito et al., 2014).

Notice what's missing from all of this: body weight, waist size, and how you look in a swimsuit. One study of more than 3,600 older adults found that those carrying the most muscle relative to their height had a significantly lower risk of death than those carrying the least. The authors contrasted this with BMI, whose link to death in older adults has been inconsistent at best (Srikanthan & Karlamangla, 2014). In other words, the bathroom scale simply can't tell you what really matters.

So why do smart people keep chasing the wrong goal?

If the evidence is this clear, why do so many intelligent, well-read adults still train for the beach? Part of it is just how we're wired. Our brains love rewards we can see soon and shrug at rewards we'll collect later. A vacation six weeks from now feels real; a body at 85 feels like it belongs to somebody else.

That's more than a figure of speech, by the way. Psychologist Hal Hershfield's research shows that when many of us imagine our future selves, our brains respond more as if we're thinking about someone else than about ourselves. The people who feel more connected to that future self tend to make better long term choices, like saving more for retirement (Hershfield, 2011). Your body works the same way. If your 85 year old self feels like a stranger, you're not going to train for them.

The other part is culture. For decades, the fitness industry sold transformation photos instead of capability, because before and after pictures are easy to market and "can still get off the floor unassisted at 88" doesn't exactly pop on a billboard.

We see this at Evolve all the time. New clients walk in with the goal they think they're supposed to have, usually a number on the scale. Then we dig a little deeper and the real goal comes out: "I want to keep up with my grandkids," or "I don't want to end up like my mother," or "I want to keep traveling for as long as I can." That's not a vanity goal; that's a life goal, and it deserves a different kind of training.

Three myths that keep people stuck

"It's too late for me."

This might be the most damaging belief in all of fitness, and the science just doesn't back it up. Back in 1990, researchers at Tufts put ten frail nursing home residents between 86 and 96 years old on an eight week, high intensity strength program. Among the nine who finished, leg strength jumped by an average of 174 percent, their speed on a heel-to-toe balance walk improved by nearly half, and two of them no longer needed their canes (Fiatarone et al., 1990). If people in their nineties can do that in two months, the door is wide open for the rest of us. Muscle never stops listening; it just needs a reason to respond.

"Lifting heavy is dangerous at my age."

This is where I'll push back the hardest, because for most adults over 50, being too careful is actually the riskier choice. The LIFTMOR trial took postmenopausal women with low bone density, exactly the group most people would tell to "take it easy," and had them do supervised deadlifts, squats, and overhead presses at above 85 percent of their max, plus jumping chin-ups with drop landings, in 30 minute sessions twice a week for eight months. Their spine and hip bone density and physical function improved, and the program proved safe; the only adverse event in the training group was one minor back spasm (Watson et al., 2018).

The National Strength and Conditioning Association now formally recommends progressive strength training, including power training, for older adults, adjusted to the individual (Fragala et al., 2019). The key word in all of this is supervised. Heavy and reckless aren't the same thing, and heavy with good coaching is one of the safest investments you can make in your future.

"If I look fit, I'm on track."

Looking lean and being capable are two different things. Plenty of thin people are surprisingly weak, and plenty of bigger bodied people are remarkably powerful. As we've seen, your grip, your leg power, your cardio fitness, and your ability to get off the floor predict your future far better than your reflection ever will. The mirror measures the paint job; those tests measure the engine.

What should you actually train for?

Here’s a simple exercise that changes how most people think about training. Picture the physical things you want to be able to do in your last decade of life, and then train for them now. Grab a piece of paper and write down five specific things you want to be able to do at 90. Not “be healthy,” but real tasks, something like this:

1. Carry two bags of groceries up a flight of stairs.

2. Get down on the floor and back up without using my hands.

3. Lift a 25 pound suitcase into an overhead bin.

4. Walk a mile at a brisk pace.

5. Catch myself if I trip.

Now work backward from that list. Because of the declines we just talked about, you need to be well above those levels today if you want to still have them thirty years from now. Think of it like a savings account that loses a little value every single year; you have to deposit enough now to still have a healthy balance when you need it.

In practice, that usually comes down to a handful of habits. Lift heavy things two or three days a week, with real effort, built around squats, hinges like the deadlift, pushes, pulls, and carrying loads. Train fast as well as hard, adding movements done with speed and intent, like quick steps, standing up from a chair as fast as you safely can, medicine ball throws, or small jumps when they're appropriate, because that's how you protect power, the quality that fades first.

Build your engine by mixing easy cardio, where you can still hold a conversation, with some harder efforts where you can't, since your heart and lungs are part of your independence too. Practice getting down on the floor and back up a few times a day; it sounds a little silly, but it's one of the most practical skills you'll ever keep. And train your balance on purpose, because exercise programs built around balance and functional training cut the rate of falls in older adults living at home by about 24 percent (Sherrington et al., 2019).

None of this requires a cold plunge or a $400 supplement stack. It requires consistency, gradual progression, and someone who knows how to adjust the plan when your knees, your schedule, or your life push back. If you have a heart condition, uncontrolled blood pressure, or a recent fracture or surgery, check in with your doctor before adding heavy lifting or jumping. That's exactly the kind of coaching we've built Evolve around.

The real return on investment

Let's zoom out for a second. We tend to think of exercise as something we do to look a certain way or "stay in shape." But maybe it's closer to a promise you're making to a future person who will depend entirely on the choices you make today. That person at 90 can't go back and lift. They can't build power they never had. They can only inherit whatever you leave them.

The beach body was always a rental; it lasts a season and then the lease runs out. Independence is more like ownership. It compounds, and every rep you do today is a deposit into a body you'll actually live in for the next 30, 40, maybe even 50 years.

The longevity economy is going to keep selling you products, and that's fine; let it. Just remember that the most valuable asset in that whole economy isn't for sale. It's the ability to stand up, walk out your front door, and live on your own terms for as long as you're alive.

The bottom line

So, stop asking, "How will I look this summer?" and start asking, "What will I be able to do at 90?" Train for the second question and the first one usually takes care of itself. Train only for the first, and you may end up spending a decade wishing you hadn't.

If you're not sure where you stand, start with the simple checks in this article: your grip, getting up off the floor, and how you handle a flight of stairs. And if you'd like a coach to help you build a plan around the life you actually want to live, that's the work we do every day at Evolve Fitness Studio. Your future self is counting on you, so give them something to work with.