Just came across this, sorry if its been posted before. The video explains all, if you can tolerate it?
https://comingsoon-tech.com/whipper-smart-climbing-sensor-personal-coach
There's obviously a lot of wearable tech coming out at the moment, I'd say this climbing one looks a lot less useful than something like this (
https://www.kickstarter.com/projects/333155164/carv-the-worlds-first-wearab...