Haswell Creative — Case Study 01
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KineticForm · Digital health · Concept

A phone on the floor that can see a knee collapsing

A physiotherapist can tell in one repetition whether a knee is caving inward. Nobody has one standing over them at seven in the morning in their living room. KineticForm reads thirty-three body landmarks at sixty frames a second and speaks a single correction into your ear before the repetition is over.

Role
Product strategy, brand identity, interface design, iOS engineering
Year
2026 — self-directed concept
Deliverables
Identity, on-device pose and cueing specification, patient app, clinician reporting views, interactive prototype
A woman mid-squat on a pale oak floor in a sunlit studio, with a phone standing on a low tripod in the foreground recording her from floor level.
One phone, floor level, roughly two and a half metres back. That is the entire hardware requirement.

The problem

Home rehabilitation does not fail loudly. It fails quietly, one bad repetition at a time. Patients keep going, the movement drifts, and the joint that was healing stops healing — usually without anyone noticing until the next appointment six weeks later.

Wearable-based rehab was meant to close that gap and mostly died on adherence. People forget to charge the sensor, or stop strapping it on by week three. A phone already in the room has none of that friction.

What a phone costs you is depth data and a reliable camera angle. Every decision here follows from accepting that trade rather than designing around it: one fixed, floor-level view, calibrated once per session, with detection thresholds tuned for the noise that view introduces.

The approach

Three moves, in order.

01

Measure, don't record

Pose estimation feeds a joint-angle solver that runs valgus, hip-hinge and trunk-lean checks every frame. The video is never written to disk. What leaves a session is a few hundred angles.

02

Coach by ear, not by screen

You cannot look at a phone mid-squat. Every correction is one short spoken phrase, budgeted to land within 200 ms of detection and capped at one per repetition — stacked corrections stop being coaching.

03

Give the clinic numbers, not footage

Nobody in a clinic will watch six weeks of squat video. A session resolves to peak flexion, valgus angle, symmetry index and cue count, plotted against the discharge criteria the physiotherapist set.

The work

What we designed.

The live session

Tracking state and fault state. The skeleton only changes colour when something is wrong, so silence is the default and a red limb means one thing only.

Before and after the rep

Programme, calibration and debrief — the three screens a patient actually touches. Everything between them happens with the phone face down on the floor.

What the clinic sees

Six weeks of sessions as four measures against the discharge criteria. A caseload review becomes a scan rather than a viewing.
A phone standing in a small tripod on a wooden floor at floor level, with bare feet blurred in the background.
No tripod required — a wall, a shoe or a water bottle all hold the angle well enough for the solver.
A physiotherapist reviewing a patient report on a laptop in a clinic treatment room.
The clinician view and the patient summary use the same language, so the two of them are reading one document rather than two.

Design targets

What the build has to hit to be worth trusting.

200ms

Detection to spoken cue, including Bluetooth latency

±3°

Joint angle agreement against marker-based motion capture

1 cue

Maximum per repetition, so corrections never stack

45 min

Continuous capture with no thermal throttling on an iPhone 14

These are design targets set with a sports-physiotherapy advisor, not measured results. KineticForm is a self-directed concept: it has not been built, and none of these figures has been validated in a clinic.