I'm part owner of a company (Halterix) that used pose detection (alternately via smartwatch accelerometer) and machine learning to quantify how well exercises a

I'm part owner of a company (Halterix) that used pose detection (alternately via smartwatch accelerometer) and machine learning to quantify how well exercises are performed. We built a demo app for use in physiotherapy to improve outcomes and ran a few clinical studies. The detection accuracy was excellent and patient reception was warm. There are a number of competitors, some with multi-sensor systems targetted to pros, some with vision systems, etc. We met with all the big fitness app makers and found generally while they weree somewhat interested in pose detection/accuracy assessment and feedback, it's not at the top of their list of priorities to implement (even to incorporate our 3rd party service).