Hey guys I'm going into the Air Force as some of you know and my MOS is going to be Combat Controller - which is like SEALs but some say even harder.

I sink like a rock and thus it is hard for me to swim distance. I can get about 500 meters in 20min, but that's with breaks every few laps to catch my breath. In order to get in I have to swim 500 meters in 15 minutes without ever stopping. I'm 6'3" 250+ at a low bodyfat (haven't had it tested), but I have a six pack.

Freestyle really takes the wind out of me but breast stroke seams to be the easiest - however breast stroke is a lost slower and my arms start fatiguing after a while. Any advice? I've never seen a bodybuilder swim before! lol