Single-camera biomechanical reconstruction

Muscle-up
digital twin.

Three attempts, reconstructed frame by frame. Explore synchronized pose, calibrated motion, model-derived depth, 3D playback, uncertainty, and evidence-linked coaching.

Read the diagnosis
60 Hz primary pose33 tracked landmarks2-model cross-check±7% scale sensitivity
Attempts detected32.17–24.77 s
Best attempt#1relative within video
Chest deficit17 cmbest estimate
Elbow timing+0.35 safter peak COM, #1
Model agreement13.6 pxmedian common-joint gap
01 / Synchronized evidence

Playback lab

Scrub once; video, telemetry, 2D overlay, plots, and 3D twin stay synchronized.

Source video + live reconstruction
00:00.00
Between attempts
download annotated MP4
Interactive 3D twin
drag to rotate · wheel to zoom
COM / bar−1.22 m
Vertical speed+0.04 m/s
Elbow angle161°
Power proxy37 W
Frame-level telemetryClick a trace or drag to zoom. Dashed lines mark attempt windows.
02 / Performance diagnosis

What stopped the transition

Each conclusion is tied to a timestamped metric and bounded by what one oblique camera can support.

Four-panel comparison of chest height, velocity, elbow asymmetry and power proxy
Attempt-level comparison. Power is a COM-derived proxy.
Timing of upward velocity, knee tuck, COM peak and elbow flexion
All attempts complete elbow flexion after peak body height.
Center-of-mass trajectories for three attempts
Calibrated image-plane COM paths; color runs start to finish.
Sensitivity ranges for key metrics
Sensitivity to smoothing windows and ±7% image scale.
03 / Scene depth

Relative depth + segmentation

Depth Anything V2 estimates per-frame relative inverse depth. Color is normalized independently for each frame and is not metres.

Selected source frame
Source
Selected person segmentation
Person segmentation
Selected relative inverse depth
Relative inverse depth closer → warmer

Do not compare depth colors across timestamps. Each view is independently normalized; it supports scene layering and a visualization-only point cloud, not metric travel.

04 / Frame evidence

Key movement events

Knee tuck, maximum COM height, and minimum elbow angle for each trial.

Nine annotated frames showing three key events for each attempt
detected bar estimated COM pose model
05 / Scientific honesty

Measured, modeled, proxied

The twin is useful because its boundaries are visible—not hidden.

Observed

Direct video evidence

  • Frames and timestamps
  • Detected bar line
  • 2D landmark locations
  • Attempt outcome
Estimated

Calibrated + model-derived

  • Image-plane metres from height
  • 33-joint MediaPipe pose
  • YOLO pose cross-check
  • Relative scene depth / masks
Proxy

Mechanics approximations

  • Segment-weighted COM
  • Velocity and acceleration
  • Vertical force / energy / power
  • Within-video ranking
Not identifiable

Requires more sensors

  • True scene depth / joint torque
  • Individual muscle activation
  • Tendon load or injury diagnosis
  • Force-plate-grade power
Pipeline, calibration, and limitations expand
06 / Open evidence

Download everything

Original identifiable footage is public with the athlete’s explicit approval. Derived data preserve provenance and proxy labels.

Original source4K HEVC videodirect evidence · 471 MB Annotated playbackPose + telemetry MP430 fps H.264 · 33 MB Analysis packageCSV · JSON · Parquet · reportreproducible data bundle Readable reportMethods + coachingMarkdown · evidence-linked