# Movement Lab

> Movement Lab is an iPhone app that measures flexibility and mobility with the phone's camera. Sixteen tests report joint angles, left/right differences and compensations, measured on-device with Apple Vision, and track them over time. It is a measuring tool, not a coach and not a medical device.

## Why it exists

Mobility and stretching apps give people routines to follow, but they don't measure range of motion, so after months of a program most users can't say whether they got more flexible. Movement Lab does the measuring and works alongside any program.

Stretching apps are sold to individuals but don't measure range. Form-check apps grade single reps but don't keep a history. Clinical range-of-motion tools measure and track, but they're sold to clinics. Movement Lab is sold to individuals, measures range in degrees, and keeps a history.

## Who it is for

Anyone who wants a real number for how well they move: hybrid athletes who run and lift, casual athletes, climbers and boulderers, lifters, martial artists, skiers, people getting back into exercise after years away, and people who sit at a desk all day.

## Facts

- Platform: iPhone only (iOS). Needs a real device; Apple Vision does not run in the simulator.
- Measurement: a single 2D camera and Apple Vision's 19 body joints. Two tests use Vision's 3D body pose.
- Privacy: pose detection runs on the phone. Camera frames are never uploaded. Only derived joint angles are stored.
- Pricing: testing is free forever, and the latest result for every movement stays visible. Full history and trends cost $59.99 a year, renewing until cancelled. Prices are in US dollars.
- Percentiles: the home screen shows where the latest result for each test ranks against people of the same sex and age range (under 25, 25-34, 35-44, 45-54, 55+). Comparisons start from published range-of-motion studies, cited in the app, and switch to Movement Lab users once a group has at least 100 people. Tests without published data show no percentile until then.
- When a subscription ends, history is locked, not deleted.
- Each test has a retest window of 14 to 28 days.
- It does not diagnose, treat or assess injury risk. See a clinician for anything that hurts.

## The sixteen tests and their stated limits

- Overhead squat: depth, trunk lean and knee tracking, from the front and the side.
- Standing forward fold: measures wrist-to-ankle distance, not fingertip-to-floor.
- Seated forward fold: a floor pose; tracking is less reliable than standing tests.
- Side split: cannot see hip or foot rotation.
- Front split: pelvis rotation is inferred from apparent hip width, not measured directly.
- Back bridge: an inverted pose; numbers are indicative only.
- Thrower's stretch: reach distance needs the 3D pose; otherwise only the projected gap is shown.
- Behind-the-back hand touch: measures wrist separation, not fingertip separation.
- Back-to-wall shoulder flexion: trunk lean is the proxy for losing wall contact.
- Seated hip rotation: tracks hip level so lifting the hip to fake range shows up.
- Seated thoracic rotation: needs the 3D pose; otherwise only a coarse proxy is shown.
- Ankle knee-to-wall: reports shin angle, not toe-to-wall distance, because Vision has no foot joint.
- Straight leg raise: a floor pose; the lower back is not visible, so pressing it into the floor is down to you.
- Thomas test: cannot see the lower back; if it arches off the bench the thigh drops further than the hip really allows.
- High step: measures ankle height, not foot height, because Vision has no foot joint.
- Pancake: fold depth is how far the chest drops, seen from the front, not a hip angle.

## Pages

- [Home](https://http--web--lsrb7jfwt8k5.code.run/): what the app measures, pricing and FAQ
- [Privacy](https://http--web--lsrb7jfwt8k5.code.run/privacy): what is stored and what stays on the device
- [Terms](https://http--web--lsrb7jfwt8k5.code.run/terms)