Mon/Wed: 10am–6pm
Tue/Thu: 7am–3pm
(later by appointment)
Lakewood Fri: 9am–12pm
Centennial Fri: 10am–2pm
(by appointment only)
Methods & Technology
See What Your Body Is Actually Doing When You Run
Video shows you what's visible. RunEasi captures everything else—the data your eyes can't see—so you get the most complete picture of how you run and why things hurt.*
RunEasi is a wearable sensor system that measures the biomechanics of running in real time. The sensor attaches to the lower back and captures objective data on how your body moves, absorbs impact, and distributes load with every step — information that isn’t visible to the naked eye and can’t be captured on video alone.
Video shows what’s happening from the outside: your stride pattern, foot strike, arm swing, posture. RunEasi captures what’s happening on the inside: how much force is traveling through your body with each footfall, how efficiently your hips are stabilizing your trunk, and whether your left and right sides are working symmetrically — or compensating for each other in ways that are driving pain or inefficiency.
At Modern Movement Clinic, we use RunEasi alongside video-based movement analysis. The two work together. Video slows down what we can see. RunEasi quantifies what we can’t. Together, they give us — and you — the clearest possible picture of how you run and what’s actually driving the problem.
The result isn’t just more information. It’s a conversation that makes the why of your injury or inefficiency immediately clear, often for the first time.
Intro Content RunEasi produces a Running Quality Score — a percentile-based measure benchmarked against a reference dataset of runners from recreational to elite. That overall score is made up of three core metrics, each tracked independently and scored from 0 to 100%.
Impact Loading How much mechanical force your body experiences with each footfall, and how quickly that force travels through your body. This is measured in two components: impact magnitude (in G-force) and impact duration (in milliseconds). Together they reveal whether you’re absorbing impact efficiently or concentrating it in ways that stress specific tissues. Runners with high impact magnitude and short duration tend to be more vulnerable to bone stress injuries and shin pain. Runners with low magnitude and long duration are often overstriding and passively absorbing shock through the wrong structures.
Dynamic Stability How much your hips move side-to-side during running, relative to forward propulsion. Technically, this is the proportion of hip movement in the lateral direction — energy that isn’t contributing to moving you forward. High lateral instability means your stabilizing muscles aren’t controlling pelvic movement effectively, which puts increased demand on structures like the IT band, hip flexors, and lower back. Dynamic stability is one of the most consistent predictors of overuse injury and one of the first things to break down under fatigue.
Symmetry The difference in running mechanics between your left and right leg. Some asymmetry is normal in every runner — what matters is whether it’s consistent, how large it is, and whether it’s getting worse. Significant, consistent asymmetry often reflects a compensation pattern — one side working harder to protect the other — and can persist for years after an injury even when pain has resolved.
Running Style Metrics (Spatiotemporal) Alongside the quality metrics, RunEasi tracks cadence (steps per minute), ground contact time, flight time, and flight ratio. These tell us how you run — whether you’re spending too long on the ground, underloading your push-off, or running in a style that’s creating more stress than necessary for your pace and build. Cadence in particular is one of the most common — and most correctable — contributors to running injury.
During the Assessment The assessment is comfortable and straightforward. You run at your normal pace — no special footwear required, no uncomfortable equipment. The sensor is small and unobtrusive. Most runners find the experience clarifying rather than clinical: for many, it’s the first time they’ve actually seen their own data.
After the Assessment You leave with a detailed session report — a structured document covering your Running Quality Score, your three core metric scores, training recommendations tied to what the data showed, and a breakdown of your running style. We also send a comprehensive written summary and personalized exercise plan following your visit, so you have everything you need to act on what we found.
Repeat Assessments For runners working through an injury or performance goal, we return to RunEasi periodically to measure whether your mechanics are changing. This is especially valuable for runners who’ve been told they’re “doing better” without any objective evidence — RunEasi gives us proof.
When Gait Analysis Helps
Who Gait Analysis Helps
Beyond runners, RunEasi data applies to any athlete whose sport involves repetitive lower-body loading — jumping, landing, and force absorption in court, field, and power sports. We also use the assessment framework for walking gait in cases where running isn’t appropriate. If you’re unsure whether this assessment applies to your situation, reach out and we’ll tell you directly.
From Our Runners
“Super knowledgeable and fun to work with!”
Jesse is awesome! I had been injured and searching for a solution for over 5 years and Jesse was the first one to nail down what was happening with my running mechanics. Super knowledgeable and fun to work with!
“Nothing but good things to say about Dr. Riley!”
Nothing but good things to say about Dr. Riley! He spends a lot of time breaking things down and getting to the bottom of complex issues. I've seen a lot of PTs and his care has been some of the best.
“I attribute my health, wellness... to Dr. Riley.”
I attribute my health, wellness, and ability to stay healthy doing what I love to Dr. Riley. He is so talented and his approach to functional movement is unlike anything I've experienced working with other physicians.
Video captures the outside — your stride pattern, arm swing, posture, foot strike. RunEasi captures what’s happening mechanically inside each stride. Specifically, it measures how much force your body absorbs with each footfall and how quickly that force travels through your body, how much your hips are moving side-to-side versus forward, and how symmetrically your left and right sides are loading. These are the factors that most commonly drive overuse injuries, and they’re nearly invisible in real time — even to a trained eye. The sensor makes them objective and quantifiable, and lets us show you exactly what we’re seeing rather than asking you to take our word for it.
No. It’s a small device worn at the lower back and runners typically forget it’s there within the first minute of running. We want to capture how you actually run — not a modified version of it — so the setup is designed to be as natural as possible.
Not at all. RunEasi is equally useful for runners who are currently healthy but want to understand their mechanics, reduce injury risk, or improve efficiency. If you’ve had recurring injuries in the past, the assessment can identify patterns that may explain why — and what to address before the next one happens. We also use it with performance-focused runners who want objective data on where they’re losing energy or carrying unnecessary load.
Yes. If your injury only presents during outdoor running, or if you’re simply not comfortable on a treadmill, we can use the outdoor protocol instead. The sensor records independently for up to 4.5 hours and syncs to the app when you’re done. The tradeoff is that we can’t capture video simultaneously during an outdoor run, but the sensor data is complete either way.
You leave with a detailed session report covering your Running Quality Score, your individual scores for impact loading, dynamic stability, and symmetry, your running style profile, and specific training recommendations tied to what the data showed. Following your visit, we email a comprehensive written summary of your assessment and a personalized plan — the same thorough follow-up you get after any visit at Modern Movement Clinic.
Running store gait assessments are typically brief, focused on foot strike and footwear recommendations, and don’t involve any objective sensor data. RunEasi measures biomechanical variables that a running store treadmill observation can’t capture — impact forces, hip stability, left-right symmetry, cadence and ground contact patterns — and benchmarks them against a population reference dataset. The goal isn’t to recommend a shoe. It’s to understand how your body is loading during running and connect that to your injury or performance goals.
A running assessment at Modern Movement Clinic is $300 for a 90-minute session. This includes the RunEasi gait analysis, video movement assessment, a physical evaluation, and a comprehensive written summary and exercise plan sent after your visit. For runners on a Performance Maintenance or Performance Optimized membership, RunEasi assessments are built into the plan — two or four per year depending on your tier. Reach out at hello@modernmovementclinic.com or 720-925-5950 with any questions before you book.
Most runners have never seen their own mechanics objectively. Schedule a running assessment and find out exactly what's going on — and what to do about it.
