is it possible for me to drop my 100 yard butterfly time by 4 seconds within a 7 month span? i am trying to go from 56 to 52, my 50 fly is a 24.88 , but my 100 is a 56.16. for some reason i always die in the back 50, i usually take out 26 but come back 30. if i train swimming 200 butterfly would this help me to gain endurance so that i wont die in the last50?
