Some feedback: 1) I would really like to stress that you should be including and focusing on _why_ more than the what. The whole time reading the landing page I was wonder _why_ this exists and what problem it would solve. It is better to speak to someone than to speak to no one.
2) Use a higher quality video. I think some of the other comments are focused on the fact that you are a guy in shorts in a video. It would tell a more interesting story to give a demo of at least one situation or several situations where this would be useful. I would get a lot more out of this video if you staged a group fitness class or 1-on-1 training. This would give me a reason _why_ this exists but with relevant context. If the video was higher quality and it was a fitness setting I don't think anyone would care that you were in shorts
3) Interface Controls section. This section is confusing because the user cannot see the interface just the gestures. It would be better to give off a list of features and benefits rather than going into _how_ you use a feature with the specific gestures. Too much complexity when people haven't bought into the concept yet. Which reminds me, you should focus on selling the concept more than telling me step-by-step how to use it.
4) More controls from phone. This section is a relief because controlling everything using gestures _sounds_ exhausting. Maybe it isn't. But this should be more emphasized than the specific gestures. Controlling everything from my phone seems more intuitive for most people. And having the gestures for an interruption free experience seems like a nice to have.
5) Have you had a yoga or fitness instructor try this yet? Have you all done a live demo with them to validate the problem? Not saying you haven't, but if you have those are probably the best screenshots or video clips to show. If you have done them why aren't you showing us that. If you haven't done them, what are you waiting for?
I run a martial arts school and we have fitness classes. We also do private and group sessions. I can definitely see the use, but you gotta sell it. What is the dream you are selling for us? How is this better than in-person classes? Is it worse? Is it worse but makes us safe from COVID? Is it the next revolutionary way to bring fitness classes online in our new environment? Can influencers use this to monetize their audience?