buddy puts up videos of their homeruns in games, shows you one AB. what it doesn't show is that he recorded all 5 ABs and had a trash swing the other 4 ABs lol
no, i'm guessing they are only showing the 'good round' of bp.
also, its more relaxed in bp knowing if you mess up there will be another pitch. its batting practice when people try new things when there isn't pressure of a game.