Re: Cushing workout video
And watching yourself as you're doing certain exercises can help you recruit specific muscles.
That's not what IDEXAN was talking about. There are lots of guys (and girls) who get into a narcissitic sort of feedback loop at the gym. Generally bodybuilder types.
In my gyms, I like to have mirrors around me so I can verify things like form and depth. I've never missed a squat in competition because I cut it shallow, I've only ever gone TOO deep and then not been able to get out of the hole. Sometimes you can see yourself favoring one side or the other even though you don't feel like you're doing it. Seeing your form in those situations can help make sure you keep things balanced.
But that's a totally different sort of thing.