Originally Posted by scr
Phelps is exceptional and his strokes are good for theoretical study. Every time I see his big 'S' butterfly photo, my right shoulder feels uncomfortable again :(
Hersey does perform a undulation. See 03:51-03:54 seconds lane 4
As she is a member of USA swimming national team, I would expect that she adapts Phelps style of entry. It is interesting to know why she does it.
Interestingly à 4:51 we see that the "girl" (not sure which country, the one that touches the wall à5:02) only kick once as the arms enter the water then she stay flat till the next cycle.