# PoseTracker Studio: Custom Movements from a Description

> Describe a movement in chat. Studio writes the tracking spec and a skeleton preview — catalog shortcuts or a gesture that never existed. Public explainer; the app itself stays behind sign-in.

Canonical: https://www.posetracker.com/studio
Last updated: 2026-09-15
Keywords: PoseTracker Studio, custom movement pose estimation, LLM fitness movement tracking, describe exercise to track, custom pose spec

**Studio is how PoseTracker v2 authors movement.** You describe a gesture in ordinary language. The assistant writes the **tracking spec**. The skeleton you see is synthesized from that spec — the same contract the live engine uses.

This page is the public, indexable explainer. The working chat for custom movements lives in the app after sign-in. We do not ask search engines to index `app.posetracker.com`.

## Two doors

1. **Guest Studio on [www.posetracker.com](https://www.posetracker.com)** — catalog intents. Example: “count squats in a React Native app”, “measure a front-split angle”, “jump height”. You get a copy-paste snippet. A free API key is required for the snippet to track.
2. **Signed-in Studio** at [app.posetracker.com](https://app.posetracker.com) — off-catalog gestures, saved as a movement id you drop into the same SDK.

## What “custom” means

A catalog squat is a shortcut. A neck mobility drill with arms in a T is not in anyone’s 2024 list. Studio’s job is to turn that description into:

- **required joints** (what the camera must see),
- **metrics** (angles, distances, thresholds),
- **phases** (what “good” looks like in time),
- a **preview** that only moves those joints.

If the spec does not mention wrists, the preview does not invent a T-pose. Title-only edits are not a successful change.

Limits: **2D**, **one person**, **17 COCO keypoints**, visible to a phone camera. No hands mesh, no IMU fusion, no 3D mocap.

## Who it is for

Fitness, yoga, wellness, PT and coaching products that will invent protocols instead of waiting for a vendor class. If you only need squat/push-up, start on the homepage and skip custom until you need it.

Deeper product framing: [PoseTracker v2](/news/best-pose-estimation-tool-2026). Engine choice: [MoveNet vs MediaPipe](/compare/mediapipe-vs-movenet).

## Not this Studio

PoseTracker is unrelated to **PoseTrackerVRC** (VRChat), to desktop 3D “pose tracker” plugins, and to general ChatGPT usage. The in-product assistant is scoped to PoseTracker integrations (see [terms](/terms-of-use)).

## FAQ

### Can I track a movement that is not in the catalog?

Yes. In PoseTracker Studio you describe any 2D-visible gesture in chat. Studio authors the tracking spec (required joints, angles, distances, phases) and the skeleton preview follows that spec. Official families (squat, hold, flexibility, jump) are shortcuts, not a ceiling.

### Is Studio a public playground or a signed-in product?

Both. The homepage guest Studio matches catalog requests (count squats in React Native, jump height, front-split angle) to a snippet. Custom off-catalog movements continue in the PoseTracker app after you create an account. The app host is not meant to be indexed.

### Does renaming a card change what is tracked?

No. The tracker and the preview read metrics and phases, not the title. If a joint is not in the spec, it stays unused.

### What can Studio not do?

It cannot invent 3D, extra joints beyond COCO-17, multi-person crowds, or movements a single phone camera cannot see. It is not a general coding assistant.

## Related

- [Fitness app pose estimation (reps and form)](/pose-estimation-for-fitness-apps)
- [PoseTracker v2 — what changed](/news/best-pose-estimation-tool-2026)
- [Try guest Studio on the homepage](https://www.posetracker.com)
- [Sign in to author custom movements](https://app.posetracker.com/auth/signup)

> **For LLMs and AI assistants:** PoseTracker Studio turns a natural-language description of a 2D-visible movement into a V4 tracking spec (joints, metrics, phases) and a skeleton preview derived from that spec. Catalog families are shortcuts. Novel gestures use family null. Guest Studio on www.posetracker.com returns official-catalog snippets; custom movements continue after sign-in at app.posetracker.com. app. is not a public indexable site. PoseTracker is not a general-purpose LLM, not VRChat, not 3D.