3D Running Analysis: Runeasi and the Runner Readiness Assessment That Reveals What’s Slowing You Down

LeeAnn Potochney, PT, DPT
9 hours ago
3 min read

If you’ve been a runner for any amount of time, you know the amount of effort and time you dedicate to the sport. Whether your goal is to improve your form, your mileage, or hit a PR—most runners think they need to train harder. Yes, you do need to put in the work, but what if the real problem holding you back from that next PR or mileage bump is how you’re moving?

If you’ve been dealing with:

Slower race times
Recurring injuries
Feeling like running takes more effort than it should

…it’s not always about doing more. It’s about doing things better and more efficiently.

Why Most Runners Miss the Real Problem

You can log miles. You can follow a training plan. You can even strength train.

(I hope you’re strength training at least 2x/week.)

But if your mechanics are off—even slightly—you’re:

Leaking energy
Increasing stress on joints
Limiting your performance

And over time, those small inefficiencies add up, which can lead either to a repeated cycle of injury – rest – return – injury

Or, those inefficiencies build to the point of you not even returning from the resting part and just give up altogether.

What a 3D Running Assessment Can Reveal

The 3D Runeasi running analysis offers an overview of three primary performance indicators: Dynamic Instability, Symmetry, and Impact Loading.

Dynamic Instability is your body’s ability to control the side-to-side wobble of your hips and provides insight into your ability to stabilize your hips effectively. If you have poor stability of your hips your efficiency decreases because energy is spent on controlling the wobble.

Symmetry is your relative balance between your left and right sides as they perform the running pattern. Essentially, your left and right sides are mirrored and should have a relationship to one another and mimic each other. Poor symmetry can be both a cause and a result of injury and can reduce running efficiency.

Impact Loading refers to how much load our body is taking on while running. It combines two different factors: impact magnitude and impact duration. Impact magnitude refers to the degree of impact exerted on your body while running—how much. On the other hand, impact duration measures how fast that impact travels through your legs and body.

Across the board, you want high scores in each of these categories for a more efficient run.

What Else Happens During a Runner Readiness Assessment?

At Amplify Physical Therapy & Performance, an assessment also involves testing ranges of motion at the hips, knees, and ankles. A movement screen also helps to detect motions and areas of your movement that may have deficits.

The next big metric to check is your overall strength and teasing out any of those differences between the left and right sides of your body. Strength and mobility deficits combined can contribute to unbalanced forces affecting your running strides and economy. Other areas of focus to cover during the assessment:

1. Stride Inefficiencies

Impact loading
Poor cadence
Overstriding

2. Hip Control Issues

Dynamic instability
Hip drop
Weak force transfer

3. Foot & Ankle Limitations

Asymmetry
Lack of stiffness (spring)
Instability on landing

The Biggest Mistake Runners Make

They try to fix symptoms instead of causes.

Knee pain? Ice it.
Tight calves? Stretch them.
Sore hips? Foam roll.

But those are often just downstream effects. The real issue is usually movement quality.

(This is exactly why pain keeps returning—something we break down here: “Why Your Pain Keeps Coming Back (Even After Rest)”)

How Fixing Mechanics Improves Performance

When your movement improves, everything changes:

You run more efficiently
You use less energy
You reduce injury risk
You unlock speed without extra effort

It’s not about pushing harder. It’s about removing what’s holding you back.

What Happens After the Assessment

This isn’t just about identifying problems—it’s about fixing them.

A proper plan includes:

Targeted strength exercises
Motor control training
Running form adjustments
Smart progression of mileage

For Runners in Westfield, NJ

If you’re running in Westfield, NJ, or nearby areas like Cranford, Scotch Plains, or Mountainside, this type of assessment gives you something most runners never get: Clarity.

Instead of guessing what to fix, you’ll know exactly: