Our expert says:
I'm not privy to Janet's exercises, so I can't help on that one! If I had to guess, I'd say that she probably does a much higher intensity session that most recreational gym goers. Two reasons - one is that I suspect she focuses her training on preparing her for dancing, which means high intensity, very hard training, though lasting a short time.
The second is that I would guess that she does her best to condense her training as much as possible.
So perhaps what you need to do is increase the intensity - you can use a heavier weight, perform the movements more powerfully, and then taking slightly longer rest periods and also reduce the number of reps you do. That should help you with some more muscle building.
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