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How do you determine what is "proper form"? All forms are arbitrary until a best one is picked, although that's highly variable to specific individuals. Did you work with licensed physical therapists to determine this? After working out for many years I'm highly skeptical of any app claiming to do this unless someone licensed is willing to say they back the results.

The only mention I can find is: "How do we determine proper form? Firefly references the average exercise performed by credible fitness experts."

Also like others mentioned, your pricing is incredibly deceptive. Make it front and center to users, otherwise "Full Access (7-day free trial). Cancel anytime." is a hard no-install for me.