A woman in your apartment building owns a new model Ford Explorer and revvs the engine for 5 minutes every morning did somebody tell her this was good to do or is it bad?

No one should have told her revving her engine for 5 minutes every morning is a good thing. It's extremely bad for the car. It wastes fuel, puts unnecessary wear and tear on the engine and its components (especially the starter), and contributes to unnecessary pollution. There's absolutely no mechanical benefit to this practice.