Fins have a lot to with the type of kicks you able to correctly. I use the TUSA Imprex Tri-Ex fins for my recreational diving and flutter kicks, but they are crap for the frog kick (even my retarded version of it) So, I also own a pair of OMS Slipstreams (OMS' version of the Jets) I use when I want to use the different kicks. I really need to sit down with my instructor and get him to teach me these kicks for real, instead of trying to flounder around on my own..