Uber for gym trainers. Would it work?

So, basically, the idea is to have an app that's basically uber but instead of getting someone to drive you from a to b you instead could quickly find a personal trainer in your area to either go to the gym with or for, possibly, a home session. I'm thinking you'd probably see a map with the gyms closest to you and the trainer that are currently try available in the gyms or would be available on short notice. The trainers could be either employed by the gyms or be independent. Would be very useful for people that travel a lot. What do you guys think?

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