In the near future would like to participate in IM 100 and 200y
however, my butterfly is my slowest style
I can swim about 5 sec faster (per 25y) doing dolphin like movments (kicks and whole body ondulation) under water with occasional surfacing to breath
Surfacing slows me down so before i continue my underwater butterfly/dolphin i take one breastroke kick and hands stroke
What are the rules defining minimum requirements for butterfly style?
Do i have to move my hands forward over the water?
Moving arms over the water, as in classic butterfly, seems to aggravate my shoulder muscles/joint (impingment?) so i am trying to limit or avoid this kind of movement
Are there any other alternatives to swim healthy shoulder friendly butterfly?
thanks