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The most useful message is a specific correction: a muscle listed that the movement doesn't really train, a step that describes the wrong thing, or start and end photos that are swapped. The 866 reference entries come straight from a public dataset and have not been checked one at a time, so errors are likely and worth reporting.

Requests for a missing exercise are welcome too. Requests for a workout program or advice about an injury aren't something this site can answer; a coach or a physical therapist can.