For someone like me, who have had an accident (dislocated kneecap) and need to focus on special muscle groups to compensate it makes sense to search for exercises based on muscle groups.

Interesting, although I wouldn't say that's the audience that the author says he's targeting.

Also - for most people who had accidents they'd probably rather click on "Dislocated Kneecap" and then have the software suggest exercises to help with that condition - vs needing to bring that knowledge to the app.