Boxing workout game.
Scored by camera tracking.

No. The camera is the only sensor. You need somewhere to prop the phone and enough room to throw a punch without hitting a lamp.

Yes, and the tutorial is the place to start. It teaches the five movements one at a time (a right, a left, a slip each way and a duck), and nothing in it can be failed. Before a round you say how much boxing you have done, and a beginner gets three minutes before the round reaches full speed.

It is real cardio if you keep moving. A few minutes of punching, slipping and ducking gets your heart rate up and works your shoulders, arms and core. The hard part of shadow boxing on your own is keeping the pace up, and that is what the targets and the bar are for.

Far enough that your hips are in frame, usually two to three metres. Every distance is scaled by your own shoulder width, so close or far scores the same.

No. Each frame goes into memory, through the pose model on your device, and out again. No frame is ever recorded, stored or transmitted, by the browser game or by the app. The privacy policy has the details.

Yes, and not just a tutorial. The browser runs a full scored Fight Round and keeps your best five. Heavy Bag and the weekly goal are in the app.

A dim room hurts tracking before it hurts anything else, so put a light on. For space, you need enough to extend an arm and take half a step sideways.