There is more to it. Doing light cardio prior to your workouts gets your muscles loose , heart rate up and the blood flowing. Yes there are benefits but they really can’t be quantified.
Doing cardio after your workout is sort of like doing fasted cardio and you are keeping the blood flowing although it is not necessarily directly to the muscle that was worked out.
Just doing cardio is a good practice and it is good to get your heart rate up.
With that being said, I think she is just being a parrot and does not really know what she is talking about.
I would like to warn you that doing too much cardio can take away from muscle growth, but that is really for the exercise fanatics and probably won’t apply to most of the population.
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