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Tread Drill: Scissor Breast, Egg-Beater Kick
Here is a quick treading drill you can do as a rest set in between fast pace swim sets.
I usually do a 3 minute tread with these three kicks (1 min each): NO HANDS
Start off with 1 min of scissor kick - alternating left / right leg kicks.
Then do 1 min breast stroke kick - vertical swimming
Then try to start alternating your breast stroke kicks into left / right kicks which is a way to start your egg-beater motion.
Then start your swim set again - resting with tread with no hands.