You’ve Never Actually Tested Your Strength - Force Frame Strength Testing Explained

What Force Frame Strength Test actually measures and why it matters

You’ve probably never actually tested your strength.

You’ve guessed at it. In a gym mirror. Against your mates.

Against a number you hit once, years ago, and haven’t checked since.

That’s not a strength test. That’s a memory with confidence issues.

Here’s the actual test: Force Frame. This is what force testing actually involves.

You push against a fixed pad as hard as you can. The system measures exactly how much force you produce, how quickly you produce it, and whether one side is quietly doing more work than the other.

Not a feeling. A number. And those numbers give us four important parts of your strength profile.

Relative strength

This tells us not only how strong you are, but how strong you are for your body weight.

Two people can produce the same amount of force. One of them may be genuinely strong for their size. The other may simply be heavier.

Same raw number. Different story.

Asymmetry

This tells us whether one side is producing more force than the other and by how much.

An asymmetry does not automatically mean you are injured or about to become injured. Bodies are not perfectly symmetrical, and they do not need to be.

But a substantial gap can still be a red flag worth investigating rather than dismissing.

The problem is that you may not feel a 15% difference.

It may not show up as pain. It may not feel like obvious weakness during everyday life. You might still be training, running and playing sport without knowing that one side is producing considerably less force than the other.

It shows up as a number.

And until you measure it, you have no reliable way of knowing whether that gap exists or whether it is improving.

That becomes especially relevant when it matches your injury history, symptoms, sport or the way you move.

Rate of force development

This tells us how quickly you can access your strength, not just how much strength you eventually produce.

Sprinting, cutting, reacting, jumping and physical contests all happen quickly.

They do not care how strong you are after three seconds of slowly building force.

They care how much strength you can turn on when the moment actually demands it.

You can be strong eventually and still be too slow for the task.

This is the one people are most surprised by.

You can max out a leg press and still lose the footrace, still get beaten to the ball or still struggle to control a landing because your strength didn’t arrive quickly enough.

It’s not that the strength isn’t there. It’s that it isn’t there fast enough.

Force-time profile

Rate of force development tells us how quickly your force rises.

The force-time profile shows us how much force is available at different points throughout the effort.

How much is available early? How quickly does it build? Does it continue rising, or does it flatten out before you reach your best result?

Someone may produce a strong peak number but take too long to get there. That strength might look impressive on paper while arriving too late to help during a sprint, change of direction, kick or physical contest.

The force-time profile shows us what happens before the maximum, not just the final number.

Two people can post the same peak strength number and still perform completely differently on the field or track because one of them gets there early and the other gets there too late to matter.

One Test. Four Parts of the Picture.

Four parts of the picture. From one testing process. That’s the key part people miss about strength testing with the force frame.

Relative strength, asymmetry, rate of force development and your force-time profile aren’t four separate tests. They all come from the same set of pushes.

Take knee extension as an example.

You complete a few short maximal efforts on each side. From those efforts, we can see how strong you are for your size, whether one leg is producing more force than the other, how quickly you can access that strength, and how your force develops across the effort.

What the Lower-Limb Assessment Looks Like

A full lower-limb Force Frame assessment applies the same process across 10 different testing positions, covering the calves, quadriceps, hamstrings and the major muscle groups around the hips.

The full profile generally takes around 30–40 minutes from start to finish.

And for the first time, you’re not guessing about your strength.

You’re working from actual data.

That data can help guide rehabilitation, identify meaningful gaps, measure whether your program is working, and determine whether your strength is genuinely returning after injury.

After testing, you’ll receive a detailed report breaking down your results, along with an explanation of what the numbers mean and where your training or rehabilitation may need attention.

That’s the overview.

Next, we’ll go deeper into each part of the Force Frame strength profile and explain what the numbers actually mean.

Book a Force Frame strength assessment