That also makes sense. It's just really hard to see everything in 2D. After you have some established key words for correcting form or something perhaps online updates would work. I don't think it will be a profitable model for trainers though. People go to trainers to get in shape. They stay with trainers because they like them and like being around them (and hopefully because they are also getting results). You lose a lot of that if you haven't been in their physical presence before.
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