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Every step,measured

Ten seconds of side-view video become angles, foot contacts and plain sentences. No sensors and no lab: just your iPhone.

One step,
twelve frames

  • 19keypointsIn every frame, from head to toes.
  • 1,200framesIn ten seconds at 120 frames per second: it looks at every one.
  • 1minuteFrom video to result, on the phone, even offline.

Step
by step

Every foot contact, not an average: the app measures each time a foot touches down, left and right, and shows you all the values in a row. So you can see whether your running form is consistent, whether one side works differently from the other and which foot contact to look at in the video.

Hover over the dots to read each foot contact.

Step by step · LucaLeft 9.8° Right 11.2°
15°0°Contact 114

Contact 13 · right · 10.5°

Seven readings
of how you run

From legs to head: each measure has its own card in the result, with the value for both sides and the step-by-step detail.

  1. 5.6°OverstridingWhere your foot lands relative to your body

    It looks at where your foot touches down relative to your knee, from the angle of your shin at that instant. The farther ahead the foot lands, the more the step tends to brake.

    In this example, 5.6°: the foot lands just ahead of the knee. 0° is a vertical shin, with the foot right underneath.

    Reliable measure: it has a score and, when it helps, something to try.

    Learn more: Overstriding
  2. 24.7°Front knee at contactHow much your knee bends as you land

    When your foot touches down, your knee is already slightly bent: it’s where the leg starts absorbing the landing. An almost straight knee often goes with a foot that lands ahead.

    In this example, 24.7° of flexion, where 0° is a straight leg. At contact a few frames are enough to shift the value by a few degrees: that’s why it’s approximate.

    Approximate measure: it has a score, but the app reads it with caution and doesn’t suggest exercises.

    Learn more: Front knee at contact
  3. 31.0°Back knee at contactWhat your back leg is doing as the other foot lands

    While one foot is on the ground, the other leg is already coming forward. This measure tells you how folded it is at that instant.

    In this example, 31.0°, where 0° is a straight leg. More flexion doesn’t mean better, and it’s often the leg far from the camera: the app reads it with caution.

    Approximate measure: it has a score, but the app reads it with caution and doesn’t suggest exercises.

    Learn more: Back knee at contact
  4. 117.2°Heel kickHow tightly your leg folds during swing

    After propulsion, the leg comes forward as it bends and the heel rises toward the glutes. This measure tells you how far the knee bends.

    In this example, 117.2° at the most folded point. It rises a lot with speed: at an easy pace it’s normal for it to be lower, and that’s not a flaw.

    Descriptive measure: the app gives you the value and explains it, with no score and no verdict.

    Learn more: Heel kick
  5. 5.4°Trunk leanHow you carry your trunk as you run

    How far your trunk leans, from hip to shoulder, across the whole clip.

    In this example, 5.4° forward. A slight lean shifts some work from the knee to the hip: there’s no right position to reach.

    Descriptive measure: the app gives you the value and explains it, with no score and no verdict.

    Learn more: Trunk lean
  6. 86.0°Arm swingHow your arms swing

    The elbow angle as the arms swing, for the left arm and for the right.

    In this example, 86.0°, where 180° is a straight arm. Letting your arms swing costs less than holding them still; no angle has been shown to be better than others.

    Descriptive measure: the app gives you the value and explains it, with no score and no verdict.

    Learn more: Arm swing
  7. 8.6°Head positionWhere you carry your head relative to your trunk

    How far your head sits forward of the line of your trunk, across the whole clip.

    In this example, 8.6°, where 0° is the head in line with the trunk. There are very few studies on the head in running: the value describes how you run; it doesn’t judge it.

    Descriptive measure: the app gives you the value and explains it, with no score and no verdict.

    Learn more: Head position

You’ll also find every angle on your own video, on the joints, frame by frame. The seven measures, one by one · The result in the app

Before
and after

Changed something in your running? Compare two analyses and see how your stride changed, measure by measure.

  1. 01

    Pick two analyses

    From your page or from the result of an analysis, tap “Compare” and pick the other one. The list goes by month; less reliable analyses are faded, with the reason, but you can still pick them.

    ‹ Luca

    Compare

    Pick two analyses. Faded ones can be picked, but the comparison will only be indicative.

    October 2026

    Oct 27, 6:30 PM

    176 steps/min · 60 fps · 18 contacts

    2

    Oct 20, 6:10 PM

    172 steps/min · 60 fps · 16 contacts

    Oct 13, 7:05 PM

    30 fps · 3 contacts

    Few complete strides: cadence not measurable

    Oct 6, 6:45 PM

    168 steps/min · 60 fps · 17 contacts

    September 2026

    Sep 29, 6:20 PM

    164 steps/min · 60 fps · 15 contacts

    1
    Compare
  2. 02

    Your stride, before and after

    Two figures run together, lined up at the hips: before in orange, after in cyan. When the foot touches the ground the animation pauses for a moment and you see where it lands. If you run with an Apple Watch, the ground moves under each one at its own speed.

    ‹ Compare

    Comparison

    BeforeSep 296:20 PM · 60 fps
    →
    AfterOct 276:30 PM · 60 fps

    Your stride, before and after

    After, the foot lands about a fifth of a leg further back from the hips: almost underneath.

    Next to each measure, the trend across all your analyses.

    Overstriding better

    12.4° → −1.4°

    ›

    Front knee at contact better

    14.2° → 23.6°

    ›

    Rear knee at contact steady

    104.8° → 108.2°

    ›

    Cadence

    164 → 176 steps/min

    ›

    Trunk lean

    2.6° → 1.9°

    ›
  3. 03

    Measure by measure

    Every measure with its value before and after, a verdict where the app gives a score and, next to it, the trend across all your analyses. If the two recordings are too different, the app tells you and shows only the values.

    ‹ Compare

    Comparison

    BeforeSep 296:20 PM · 60 fps
    →
    AfterOct 276:30 PM · 60 fps

    Next to each measure, the trend across all your analyses.

    Overstriding better

    12.4° → −1.4°

    ›

    Front knee at contact better

    14.2° → 23.6°

    ›

    Rear knee at contact steady

    104.8° → 108.2°

    ›

    Cadence

    164 → 176 steps/min

    ›

    Trunk lean

    2.6° → 1.9°

    ›
  4. 04

    Up close

    Tap a measure: both values, the legs at contact with the part in question lit up, the trend explained and what it is, in plain words.

    Overstriding

    Done

    Before · Sep 29

    12.4°

    After · Oct 27

    −1.4°

    The legs at contact

    Before in orange, after in cyan, lined up at the hips. The lit-up part is the shin: the more it leans forward, the further ahead of the body the foot lands.

    In your analyses

    Each dot is an analysis, in time order; higher up, the foot lands further ahead.

    beforeafterothersless reliable

    What it is

    How far ahead of the body the foot lands, measured by how much the shin leans when it touches the ground. The higher it is, the more each step brakes.

To hand over
and to send

When the analysis is done, the Share button gives you a PDF for the athlete and a video that tells the run on its own, in half a minute.

A preview. The real video opens with the athlete’s name and shows every score.

The analysis video

The run next to how the app sees it: first the skeleton, then the points, then the scores one at a time, up to where to start. The body part being discussed lights up.

Landscape or portrait, like the recording. One tap and it’s ready: send it to the athlete or post it.

  • Skeleton
  • Points
  • Scores
  • Where to start

The PDF, with your name on top

Your logo or your name at the top, and below it the analysis in plain words: scores, the stride frame by frame, where to start.

  • Four styles, chosen each time: for the athlete, for the clinic, for the team or for the screen.
  • Suggested exercises with Stick’s figures and a QR code to watch them in motion.
  • The notes you write stay in the PDF: they never go online.

Numbers
in words

Below the cards, the result describes your running form in three sentences: how you land, how you recover your leg, how you carry your trunk.

Landing
The foot lands under the body with the knee slightly bent: an efficient foot contact.
Leg recovery
Likely, the back leg recovers well and comes forward quickly.
Trunk
The trunk leans forward about 5° throughout the run.

From the studies
to your running

Each measure has its meaning explained with studies on running biomechanics, cited by name. When the studies support it, the app suggests gait retraining, with the dose and what to watch for.

Exercises in the app

Measure your
next run

Runify Motion is for iPhone. No subscription, no account: install it, record ten seconds and read your running.

Coming soon to the App StoreEvery feature, item by item