Fins are a personnel issue & too often the real properties of the fins of choice go unknown. Do you know the stiffness & rebound your fins today? Fin choice can impact air consumption & your pocket book so choose wisely. It is my belief that you want the stiffest fin that you can get & that you can use. I am currently using ones with stiff 92 rebound 85 looking for version with stiff 90 rebound 100. I find that I can out swim most with no effort, one must however take care to not overwork their dive buddy. With students I frog kick most of the time. I have and do use other fins, ones I use the most are Force Fin Pros, looking at Tan Delta. These fins have many features & with inserts can be used for multiple things, remove the inserts to go up a size & fit your dry suit, with inserts barefoot or with light wet boots. Exercise with any fin regularly as this exercise activity is different than walking or running. During the season I am in the water a number of times a week & this helps