I'm just a TI newbie but from what I gather a 2bk is used to waste less energy on something (kicking) that yelds so little results propulsion wise. So a 2bk is used to help balance.
Personally I prefer a 2bk, or something similar to it (I dont' mind too much if it's 2b and a half kick plus a demi flutter) :)
You can feel your body gliding in the water much better this way and is also true that you save a lot of energy.
best
val
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