BackTracker

Back-angle biofeedback with two smartphones.

This page isn't on https:// - the phones' motion sensors will not work. Open it from its https address.

On the laptop / desktop

Shows the live angle, the sine-wave target and the QR codes for the phones.

On a phone

Easiest: scan the QR code shown on the laptop with the phone's camera. Or type the session code:

Session
Sensors
–
Rate
–
Phone lean
–
Screen
–
Attach the phone: portrait, screen facing out (away from the body), top of the phone towards the head. Keep this page open and the screen on until the session ends.
BackTracker smartphones

1. Connect phones

Session -----
–
Lower back (pelvis)
Upper back (T10)
Lower –
Upper –
No camera? Connect by code

On the phone open , type the code and choose the role.

2. Calibrate

3. Target sine wave

Display

Session

Keys: N neutral · F forward bend · R restart wave · M marker