Core concepts

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Six objects carry almost everything. Understanding how they relate is the difference between calling endpoints and building an integration.

Session

One video, analysed. The central object. A session is created against an (activity, exercise) pair, optionally attached to a Client, and moves through pending → processing → completed | failed.

A session owns its results: metrics, metric_targets, the annotated video at analyzed_url, a thumbnail, and capture_findings — quality warnings about the footage itself.

Creating a session is what costs quota. Not uploading, not polling.

Client — the athlete

Who the movement belongs to. A Client carries a profile: height, weight, gender, leg length. Those are not decoration. They feed the analysers directly:

Anything mass-dependent — ground reaction force, power — is computed from the athlete’s mass. Without it, those metrics are suppressed rather than guessed.
Distances in the frame are converted to real units using the athlete’s height. Without it, the analyser falls back to an assumed torso length, which carries roughly ±20 % scale error.
Green zones shift by gender and body size.

Attaching a Client is optional and almost always worth it. It is also what makes a sequence of sessions into a history rather than a pile of clips.

Activity and Exercise

What movement was performed. activity is a family — running, weightlifting, mobility. exercise is the specific movement within it — Treadmill, Back Squat, Overhead Squat.

Together they select the analyser. They are exact-match strings, not free text: "Overhead Squat" works, "overhead squat" does not. There are 21 activities and 107 pairs. Read them from the catalogue at runtime rather than hardcoding — see Activities and exercises.

Camera view

Which plane the movement was filmed from — side, front or back. This is not a label; it picks a different analyser.

The sagittal (side) analyser computes stride, ground contact, speed and sagittal joint angles. The frontal analyser computes pelvic drop, hip adduction, step width and left/right asymmetry. Send the wrong one and you get a technically complete report about the wrong thing.

Each (activity, exercise) pair supports a specific set of views. Sending an unsupported one is rejected at create time rather than producing an empty report.

Metric

One measurement. A { key, value_num, value_json } triple.

value_num is a scalar in SI units — centimetres, metres per second, milliseconds, degrees. value_json carries anything that is not a single number: a time series, a 2D trajectory, a categorical reading.

There are 620 distinct metric keys across the platform, but any one session emits only the ones its (activity, exercise) pair defines — typically 10–40.

MetricTarget — the green zone

What “good” means for this athlete. For each metric, a min_good / max_good band, already resolved for the athlete’s gender and body size.

This is why metric_targets is a separate object from metrics: the measurement is a fact, the target is a judgement, and the judgement moves with who is being measured. Rendering a value without its target tells a coach a number; rendering both tells them something actionable.

Solution — a battery of sessions

Several sessions rolled into one report. A Solution is a named protocol — a running gait assessment, a jump battery — that binds specific sessions to specific slots and produces a combined report with its own insights.

Most integrations never touch Solutions. If yours produces multi-test assessments, they are the object you want.

How they fit together

flowchart TB
    Client["Client<br/>the athlete"]
    Session["Session<br/>one video"]
    Metric["Metric ×N<br/>value_num | value_json"]
    Target["MetricTarget ×N<br/>the good range, per athlete"]
    Findings["capture_findings<br/>'this footage has a problem'"]
    Video["analyzed_url<br/>the annotated video"]
    Solution["Solution<br/>a protocol"]

    Client -->|"has many"| Session
    Session --> Metric
    Session --> Target
    Session --> Findings
    Session --> Video
    Solution -->|"binds several"| Session

Everything hangs off a team: an API key belongs to one, and sees exactly that team’s data.