Just two words on going "en danseuse" (dancing on the pedals):

1) watch out not to overdo it and end up sliding on the side if you loose proper contact with the road (road tires have a very narrow surface of contact with the pavement)

2) rocking the bike from side to side can make you spend more energy than it will give you.

so rock gently and make sure you strenghten your grip with the hand opposite to the side you're rocking to.

take care ladies!