That’s true, and since it’s only tracking head movement at the moment, some further refinements would be needed to account for good positioning. I’d like to develop it further to see what else this technique can recognize.
Yeah wearables limitation is they rarely track both open and closed chain exercises. closed chain = dips/pullup where you move body through space, usually hands locked so watches/bands don't work, open chain = body fixed, move limbs like BP where this method won't work well. If it's something being worn, it needs to be adjusted to differnt positions to track different exercises, which makes implementation finicky.