Forget Muscle Size — Train for Strength and Power as You Age

There's a piece of advice making the rounds that you have to become a powerlifter to age well — that the size of your biceps and quads is what stands between you and a nursing home.

A recent New York Times article pushed back on that, and it lands right where we've always stood: when it comes to longevity, bigger isn't the goal. Functional is. What matters isn't how large a muscle looks, but what it can actually do — how much it can move, and how quickly.

That distinction is the whole game.

Strength, Not Size

We're constantly reminded that muscle mass starts declining as early as our 30s. True. But the experts quoted in the article make a sharper point: chasing muscle size is the wrong target. The thing that keeps you out of a nursing home is strength and power — the ability to move heavy things, catch yourself when you stumble, and get up off the floor.

"That's strength. That's power," said Michael Ormsbee, a professor of exercise physiology at Florida State. The goal of lifting as we age, added Donald Dengel of the University of Minnesota, "should be building or maintaining strength, not muscle mass."

This is exactly why we don't measure progress by how someone looks. We measure it by what they can produce — force, and the ability to apply it on demand.

The Quiet Warning Sign

Here's the most useful idea in the whole article, and it costs nothing to check.

The clearest sign you need strength training, Dr. Dengel said, is when you start adapting your daily life around a loss of strength. His example: older adults who begin storing cans and dishes on lower shelves because lifting to the higher ones has gotten hard.

It seems harmless. But the moment you stop using a muscle group, it accelerates its decline. The workaround becomes the cause.

So watch for the small accommodations — taking the elevator for one floor, asking someone else to carry the heavy bag, lowering the shelf. Those aren't just inconveniences. They're early signals.

A few simple self-checks the article suggests:

Sit-to-stand (rising from a chair without using your hands) — a good proxy for lower-body power
Push-ups — a read on upper-body strength
Carrying weight — picking up and walking with something heavy tests grip and whole-body strength

Why Power Fades First — and How to Keep It

As we age, we lose fast-twitch muscle fibers — the ones responsible for explosive, rapid movement — faster than we lose the slow-twitch fibers used for endurance. And power declines faster than raw strength.

Those fast-twitch fibers are what fire when you catch yourself stepping off a curb wrong, or get your foot underneath you mid-stumble. "Not just lifting heavy weight," as Dr. Ormsbee put it, "but lifting weight quickly so you have the reaction time and the speed to get your foot underneath you as you fall off a curb."

The article suggests some athletic, ballistic ways to train this. We'd offer a different path — because most people aren't ready for jumping and ballistic movements, and they carry real injury risk for the very people who'd benefit most.

Here's the part that often gets missed: you don't need to move fast to train power. You need to try to.

Fast-twitch fibers are recruited by intent — by attempting to move a meaningful load as forcefully as you can. Against heavy resistance, the bar may move slowly even when you're pushing with everything you have. That maximal effort is what calls the fast-twitch fibers into action and keeps them on the roster. You get the power adaptation without ever leaving the ground.

This is one of the things adaptive resistance (the ARX) does especially well. The machine matches resistance to exactly how hard you push, moment to moment — so you can apply maximal force and full intent through the entire range of motion, safely, without momentum, dropped weights, or impact. You train the fast-twitch system hard while a motor absorbs the risk. (More on how that works here.)

What Functional Training Actually Looks Like

The principles the article lands on are the same ones we apply every session:

Lift heavy enough to matter. Dr. Ormsbee recommends working in a range where the last few reps are genuinely difficult — meaningful resistance, not light weights for endless reps.
Train the patterns you use in life. Pressing overhead, hinging to pick things up, single-leg work like step-ups and split squats. These build strength in the exact movements daily life demands — carrying groceries, lifting a child, getting off the floor.
It doesn't take long. About 20 minutes of focused, high-quality effort is enough. More isn't better; harder and more precise is.

One place we'd go further: training close to failure

The article advises stopping short of failure — heavy enough that the last reps are hard, but not the point where you can't do another rep. We read that recommendation for what it is: a broad-population safety hedge. When you're writing for millions of people who'll train alone, with free weights, often without supervision, telling everyone to push to failure is a good way to get people hurt. So the cautious advice makes sense for that audience.

But it isn't the most effective approach — and for our clients, it isn't necessary to hold back. Taking a muscle to or very near true fatigue is what produces the deepest adaptation signal. The catch in a typical gym is that the last, hardest reps are also where form breaks down and momentum, balance, or a dropped weight create risk.

That's precisely the problem machines and a trainer solve. On guided, fixed-path equipment — and especially on adaptive resistance like the ARX, where a motor matches your effort and there's no weight to drop — you can train all the way to that point safely, with form intact and zero impact. You get the full stimulus without the danger that makes "stop short" the sensible default for everyone else.

And here's the payoff that surprises people: because that effort goes so deep, you don't have to do it often. A single hard, controlled session that reaches real fatigue gives the body a strong reason to adapt — and the days afterward to actually do it. That's how 20 focused minutes, once or twice a week, can outperform hours of holding back.

Dr. Dengel's most relatable example needs no gym at all: a filled milk jug weighs about eight pounds. Press it overhead onto a high shelf eight times. As you get stronger, add water or reps — or pick it up off the ground like a deadlift. Strength training doesn't require a barbell. It requires intent and progression.

The Bottom Line

You don't need to get bigger to age well. You need to stay strong and powerful — able to move load, and able to produce force quickly when life demands it.

The good news is you can train both safely, without jumping, slamming, or putting aging joints at risk. Heavy, controlled, high-intensity strength work — performed with full effort and intent — preserves the fast-twitch fibers that keep you on your feet, in about 20 minutes a session.

That's not a compromise. It's the whole point.

Muscle is the organ of longevity — but it's what your muscle can do that keeps you living well.