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Record,read, try

Ten seconds of video become a skeleton, seven measures and, when it helps, an exercise to try. Here’s the app, from start to finish.

Giulia Rossi

Wed 21 Oct · Treadmill · 120 fps

85

Front knee at contact

L 31.1° · R 24.7°

The right knee is 6° straighter than the left

Approximate · Few foot contacts, uncertain keypoints or video below 60 fps.

Excellent
87

Overstriding

L 2.3° · R 5.6°

The right foot lands with the shin angled 3° more than the left

Excellent
100

Back knee at contact

L 31.0° · R 69.7°

Approximate · The back leg is often the one far from the camera, hidden by the other.

Excellent
5.4°

Trunk lean

There’s no universal threshold for lean: it depends on speed and style.

Descriptive

Giulia’s running form at a glance

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 your run
to the result

  1. Three tips and you’re ready

    Before. Phone steady at hip height, side-on, the whole person in the frame. You read them the first time; after that, you skip them.

    How to record · 2 of 3

    Side-on, head to toe

    The person should be side-on, fully in the frame and filling at least a third of its height, ideally half.

    NextSkip

  2. Record your run

    15 seconds. A five-second countdown with beeps to get going, then recording: at 120 frames per second, if your phone supports it, you get the finest detail and the most reliable measures; 60 works fine too. On a treadmill, on the road or on a track.

    00:07 · 120 fps
    ImportBeep

  3. Pick the best ten

    A few seconds. Move the window to the stretch where you run most evenly. Already have a video? Import it from Photos or Files.

    Choose 10 seconds

    Move the window to the stretch where you run most evenly.

    0:000:15
    Analyze

  4. The phone does the rest

    About a minute. It finds the skeleton in every frame, the foot contacts for each side and the angles that matter. All on the phone.

    Analyzing your run

    744 of 1,200 frames. You can put the phone down: the video doesn’t leave it.

    • The skeleton in every frame
    • Foot contacts, left and right
    • The angles that matter

  5. Read the result

    Right away. A card for each measure, with the two sides compared, and your running form described in three sentences.

    Giulia Rossi

    Wed 21 Oct · Treadmill · 120 fps

    85

    Front knee at contact

    L 31.1° · R 24.7°

    The right knee is 6° straighter than the left

    Approximate · Few foot contacts, uncertain keypoints or video below 60 fps.

    Excellent
    87

    Overstriding

    L 2.3° · R 5.6°

    The right foot lands with the shin angled 3° more than the left

    Excellent
    100

    Back knee at contact

    L 31.0° · R 69.7°

    Approximate · The back leg is often the one far from the camera, hidden by the other.

    Excellent
    5.4°

    Trunk lean

    There’s no universal threshold for lean: it depends on speed and style.

    Descriptive

    Giulia’s running form at a glance

    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.

Giulia Rossi21 Oct 2026 · 18:35
85

Front knee at contact

L 31.1° · R 24.7°

The right knee is 6° straighter than the left

Approximate · Few foot contacts, uncertain keypoints or video below 60 fps.

Excellent
87

Overstriding

L 2.3° · R 5.6°

The right foot lands with the shin angled 3° more than the left

Excellent

The skeleton
on your video

Angles on the joints
Knee, elbow and trunk on the camera side, as the video plays. Pick the other side from the menu.
From one foot contact to the next
The timeline shows when each foot touches down and leaves the ground; the arrows jump straight to the next one.
In slow motion
Tap the speed and the video slows down to a tenth. Pinch with two fingers to zoom in.
Save and export
From the menu, save the frame with the skeleton and your drawings, or the video with the skeleton.

Draw
on the video

Pause the video where you need it and draw on top, like on a whiteboard. Show an athlete or a patient exactly what you see.

Five shapes
Freehand, line, dot, circle and angle. Draw the angle with two lines and the value appears at the vertex.
Six colors, three widths
Yellow, green, red, blue, white and black. The eraser removes a stroke; undo goes back one step.
Just the skeleton you need
Hide the head, arms, trunk or one leg and keep only the part you’re talking about.
They stay with the analysis
Open the analysis again and your drawings are there, and they’re in the frame you save too.
Giulia Rossi21 Oct 2026 · 18:35
85

Front knee at contact

L 31.1° · R 24.7°

The right knee is 6° straighter than the left

Approximate · Few foot contacts, uncertain keypoints or video below 60 fps.

Excellent
87

Overstriding

L 2.3° · R 5.6°

The right foot lands with the shin angled 3° more than the left

Excellent

The movement is the one measured from the side; the body’s depth is built.

Drag it to turn it.

Your stride
in 3D

Tap “3D” on the video and the run becomes a skeleton you can turn: watch the movement on its own, a little from the side or from above, in slow motion.

The whole recording or one stride
Watch the whole analyzed run again, or one real stride that repeats without a break.
Moments, with their values
At every contact, overstriding and the knees light up; during swing, heel kick; trunk and arms stay on. The numbers are the ones in your result.
Slow down at contacts
Around every contact, playback drops to a tenth, then picks up again: no need to pause it by hand.
Notes on the joints
Tap a knee, a shoulder or an ankle and type. The note appears when the stride reaches that moment.

Every measure,
explained

Tap a card and you’ll find your foot contact drawn out, the value at every step and three answers. Pick one: the phone opens it.

Overstriding11.2°
Room to improve

Shin angle at contact, right side

Both feet touch down ahead of the knee.

Your foot contact

11°
Right foot contact · 3.48 sGo to frame

Step by step

15°0°Contact 114

Left 9.8° Right 11.2°

The angle of your shin at the moment your foot touches down. 0° means a vertical shin, with the foot under the knee; the higher the value, the farther ahead of your body the foot lands.

Gait retraining

Slightly higher cadence

Slightly quicker steps at the same speed.

When it may help

If your step looks very long relative to your body during stance, or your knee is barely bent when your foot touches down.

5 + 5 min

dose

—

rest

Low

effort

What to do

  1. 1Run at your usual speed and raise your cadence a little: start at +5%.
  2. 2For 5 minutes, follow a metronome or your watch set to the new cadence.
  3. 3For another 5 minutes, hold the new cadence without feedback.

Evidence

Effect on form: moderate

Heiderscheit 2011; Lenhart 2014; Lieberman 2015; Schubert 2014 review.

Exercises
with evidence

A catalog of gait retraining, drills and strength. Each card says when it may help, what to do, what to watch for and which studies support it.

The analysis leads to a suggestion when the studies justify it, and first the app asks whether you have pain or an injury. Assign it to someone and their plan is ready as a PDF.

Exercises, your own tooPlans for your athletes

Learn
about running

The Runify blog, inside the app: articles on training, recovery and mindset. The ones linked to your latest analysis come first.

After an analysis where overstriding has room to improve

Are you running the wrong way? 3 technique mistakes that slow you down

12 May 2026 · 3 min

  • Running economy: the real secret of runners who never seem to get tired

    22 May 2026 · 6 min

  • When not to change your running technique

    23 May 2026 · 10 min

Training · 35
Linear, undulating, block or polarized: which periodization is right for you?
Recovery · 41
Sleep and performance: how much sleep you need to recover
Mindset · 17
Motivation is the fuel that gets you started, not the engine

Learn

Understand
running.

The Runify blog: articles and guides to get started, get back into it and build consistency.

From your 21 October analysis

Overstriding

Room to improve

Are you running the wrong way? 3 technique mistakes that slow you down

12 May 2026 · 3 min

Running economy: the real secret of runners who never seem to get tired

22 May 2026 · 6 min

When not to change your running technique

23 May 2026 · 10 min

Training

Periodization, intensity, volume, long runs. The core of the work.

35 articlesExplore

Recovery

Sleep, mobility, nutrition and your body’s signals, to stay healthy.

41 articlesExplore

Mindset

Handling fatigue, motivation and the mental side: the part of the work no one sees.

17 articlesExplore

A runner in a backlit park, blurred behind the grass

And also

Import videos
From Photos or Files, even ones recorded on another phone.
Several passes on a track
Run back and forth in front of the camera: the app analyzes the longest pass.
Your people
Every analysis belongs to someone: you or your athletes.
Plans as PDFs
The exercises chosen for someone, ready to send.
No account
Install it and use it. No sign-up, no subscription.
On the phone
The analysis runs on the iPhone and the video stays there.

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