What strength training can i do to help me with my butterfly?

Specifically with free weights. I do a lot of ab work already, but any suggestions there would be appreciated too.


I swim butterfly but I'm looking to shave some time off my 100 and 200. I've gotten myself into great shape from running and stuff so I'm not usually short of breath during my races. but sometimes it feels like my arms start to give out after a 75 or 100. i really just need exercises that will help with fly, so back, shoulder, arms, etc.


thanks!


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