Why You've Stopped Getting Faster

Somewhere in your thirties you start filing things under age.

The half step you don't get to on the tennis court. The way you're last to the loose ball now when you used to be first. The feeling that the first rep moves differently from how it used to, even though the weight on the bar is the same or heavier.

You don't investigate any of it. You file it, you train a bit harder, the log keeps going up, and the thing you actually noticed never changes.

Here's what's worth knowing before you accept that explanation: getting older and being undertrained in one specific quality feel identical from the inside. Only one of them responds to training. And almost nobody checks which one they're dealing with.

Strength is two things, and you only track one

We use one word, strong, for two separate physical qualities that are trained differently, that decline differently, and that trade off against each other.

Force is how much you can move. The number on the bar. This is the one everybody tracks, because it's visible, it's easy to log, and it goes up in a satisfying line.

Velocity is how fast you can produce that force. This is the one almost nobody tracks, because there's nothing in a normal gym that measures it and no number to write down.

They're related but not interchangeable. You can be very strong and slow. You can be quick with nothing underneath you. Every person sits somewhere on a line between those two extremes, and where you sit determines what training will actually move you forward.

The practical problem is that if you only ever track force, you can get measurably stronger for six years while the quality you actually noticed losing sits exactly where it was.

What a force-velocity profile is

Plot force against velocity across a range of loads and you get a line. That line is your profile.

In practice: you perform the same compound movement at several different loads, and the speed of each rep is measured. Light loads move fast, heavy loads move slowly, and the shape of the relationship between the two tells you which end of the spectrum is under-developed.

Three broad outcomes.

Force-dominant. Good absolute numbers, slow off the floor, poor acceleration. You have the engine and not the gearbox. On a pitch this is the person who's strong in every measurable way and still arrives second to the ball.

Velocity-dominant. Quick and reactive, no strength base underneath. Fast until something gets heavy, and then nothing. This person often feels athletic and plateaus early.

Balanced. Neither end is the obvious limiter, which tells you to look elsewhere: at recovery, at asymmetry, at technique. That's still useful: it rules out a whole category of training as the answer.

Why you've been training the end you were already good at

Here's the part that explains six years of consistent effort producing no change in the thing you care about.

Left to our own devices, almost all of us train toward the quality we're already strong in. It isn't laziness. It's that this is the training that feels good and produces numbers that move easily. The force-dominant lifter adds weight to the bar because adding weight works. The naturally quick athlete does the explosive work because he's good at it and it's enjoyable.

So the gap never closes. The training is consistent, well-intentioned and genuinely productive. It's just answering a question you'd already answered.

And because the log keeps improving, there's no signal that anything is wrong. You can't tell the difference between an intervention that's working and an intervention that's working on the wrong thing, if the only thing you measure is the thing it's working on.

Why this reads as ageing

Maximal strength holds up remarkably well into your forties and beyond, provided you keep training it. The research on this is consistent and fairly encouraging.

Velocity qualities (how quickly you can produce force, how efficiently you absorb and return it) decline earlier. And because nobody measures them, there's no baseline to notice the decline against. There's no moment where a number drops. It just arrives, gradually, as a general sense of having slowed down, and the available explanation is the obvious one.

Which is why "it's just age" is such a satisfying answer. It fits, it requires nothing of you, and it's unfalsifiable without a measurement.

What the profile actually changes

This is the only test in our assessment battery that answers what kind of training you need rather than how much.

Consider two people who've plateaued, same sport, same age, same complaint. One can't produce force quickly: he's strong off the floor and slow everywhere else. What he needs is jump work, contrast methods, lighter loads moved with real intent: training that teaches a system he already owns to express itself faster.

The other has the speed and no base underneath it. What he needs is the unglamorous version: heavy compound loading, progressive, patient.

Now give each one the other's intervention. The first gets twelve weeks of heavy work and gets stronger, measurably, while his actual gap doesn't move. The second gets plyometrics, which asks a system to produce force rapidly when it can't yet produce it slowly.

From the outside those two people are indistinguishable. Same age, same sport, same training history, same frustration. You can't tell them apart by watching, and neither can they.

That's the entire argument for profiling. Not that it produces a magic number, but that it tells you which of two opposite answers you're looking at.

What it doesn't tell you

Worth being direct about the limits, because this test gets oversold.

It isn't a precise prescription. Extrapolating theoretical maximum force and velocity from field-based testing carries real estimation error compared with laboratory force plates. We use the profile directionally (force-dominant, velocity-dominant or balanced), not as a source of exact training loads. Anyone handing you an intervention calculated to decimal places from a field-based profile is overstating what the method supports.

It isn't a prediction of injury. It describes a current neuromuscular quality. Nothing more.

It doesn't work as a one-off comparison. Between-session reliability is less well established than within-session, so a profile is only meaningful when it's retested under identical conditions: same movement, same loads, same equipment. A profile compared against someone else's, or against a published benchmark from an athletic population, tells you very little.

It isn't the whole picture. The profile tells you which quality is under-developed. It doesn't tell you whether you're recovering well enough to train it, whether one side is carrying the other, or whether a movement pattern needs addressing before load goes anywhere near it. That's why it sits inside a battery rather than standing alone.

The question worth answering

If you've been consistent for years and the sport hasn't moved, there are only a few possible explanations, and most of them are testable.

You might be training the quality you're already best at. You might be asymmetrical in a way that's invisible in bilateral movements. You might not be recovering enough to adapt to any of it. Or you might be getting older in exactly the way you assumed.

That last one is possible. It's just the one nobody checks before accepting it, and it's the only one on the list that doesn't respond to anything.

Common questions

What's the difference between strength and power?

Strength is how much force you can produce. Power combines force with the speed at which you produce it. Two people lifting the same weight can have substantially different power outputs, and power is usually the quality more closely related to sporting performance.

Does power really decline before strength with age?

The general pattern (velocity and rate-of-force-development qualities declining earlier than maximal strength) is well supported in the literature. The practical consequence is that someone can be stronger than they were at 30 while being noticeably slower, and experience that as general ageing rather than as one specific, trainable deficit.

Can you train both strength and speed at once?

To a degree, particularly if you're relatively untrained. The more trained you are, the more the two compete for the same limited training time, and the more the sequence matters, which is where knowing your profile changes what you do first.

How do I get a force-velocity profile measured?

It requires velocity measurement across multiple loads under standardised conditions, which isn't something you can do by feel or estimate from your training log. It's part of the FORMA performance assessment in London, alongside strength symmetry, reactive strength and recovery testing.