How to train and gain muscular endurance for 100m Butterfly?

I swim the 100 fly. I am 15 too.

you should do dips to improve the strength of your triceps so that your arms don't get so tired.. Also, put on a pair of flippers and do a lot of dolphin kick on your back to improve your endurance for your legs. If you aren't always able to get to a pool, running really improves your endurance (although it doesn't use the same muscles as swimming) but it does really help your endurance. you will definitely be able to work up to a solid 100 fly in 8 months. Something else in the pool that is painfully difficult, but will imrove your fly immensely is to pull fly, that is use only your arms while doing the butterfly. It is virtually impossible to do for more than 25 yards and in the beginning you'll probably only be able to go about 10, but it will strengthen you a lot. Good choice choosing fly as your stroke

Weight lifting will always practice both. yet you may concentration better on both or. for example, better rep will artwork better the persistence and a lot less rep, yet heavier, will practice for strengh and length. better or a lot less. in simple terms see out of your effects.