Learning the underwater dolphin will help make you faster at the start of every race, and off every turn. Learning the underwater dolphin in every position ...on the front, back, or side... will give you an even greater advantage because you'll be able to adjust to every angle of pushoff and you'll be able to check out your competition.
Put all the directions together. This revisits and old drill called 360 Dolphin Rotation that we posted a few years ago, but is now a bit more integrated into the sequence. Do your best to always driv the fingers forward, and not up and down.