[lspreafico]

Hey! Lorenzo from Quell here :) We're working super hard to make sure that Quell trains effectively different muscles group. We've been talking to professional athletes to find creative ways to do so, and are developing hardware and software features to make sure that Quell supports a varied workout that trains both upper and lower body. We don't know specific device specs yet, but we're really focussed on keeping the game light, so that users can run it on their mobile phones with no issue - this will also reduce the impact on battery life! :) Regarding the camera, it's something that we're considering for the future, but we're super proud to say that our accuracy is already particularly good, and not having to set up a camera is one less hassle for user experience! There's very little chance of you hitting yourself in the face: the elastic mechanism is made in such way that the resistance only kicks in midway through the punch! This increases safety and improves how satisfying the punches are, as many of our users told us!

Hope that answers your questions :)