| The dolphin-like motion of the body through the water is known as undulation.
It's good for the stroke but you need to control it.
Keep the hips moving up and down with the kick and stretch the arms forward as you put them in the water.
This will stop you diving too deep. Try and keep the dolphin motion going but keep it close to the surface.
More power in the legs
You should be able to keep a good regular kicking action going all of the time.
Now try and put some extra power into it by whipping the legs downwards each time you kick.
Each kick should finish with the legs straight
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