This particular 'Rule' of writing drives me crazy. I'm all for showing a character's fear/anxiety/excitement when it seems appropriate to do so, but must I do it every time?
Hearts apparently lurch, leap, contract, skip, gallop, freeze, break, soar, sink, stop(!). What a multifunctional organ it is! Can you think of any more? I wonder if my heart's any good at typing? That'd... be very useful. Or how about cooking dinner? :)
Is it really a horse-whipping offence to occasionally say, 'She was scared' and leave it at that? If spoon-feeding the reader is wrong ('The Rules', paragraph 1, subsection 345 B. Just kidding!)then should I describe each and every emotion of my hero and she-ro in graphic detail?
Can't my well-muscled blood pump simply move blood around and leave it at that?