Ok so after a few years of being idle I've decided to start swimming again, reason being it's very good for the body and I miss the success I've had in the sport in the past (like I was pretty good and life was great and I was somebody). Anyways, my best stroke is butterfly. I can do 50m very very quickly but for some reason I slow down a h**l of a lot on the last 50m. I have got asthma but I think it's under control 'cause I use my inhalers regularly.
I just wanna know what I can do to keep me going fast and not slow down so much. Seriously I get really tired it's weird. (I don't normally do 100m fly, used to doing 2x 25m).
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