For some reason, no matter what I do, I can never have adequate endurance. Mid Soccer season: Running A LOT every day. Still did nothing for my endurance. Mid Swim season: Swimming 6,000 yards every day. Still nothing. Mid Rugby season: Running A LOT every day and also lifting. Still nothing. I'm VERY fast and VERY strong for being 170 lbs. but I can't maintain it for long. Is the fact that I have overactive adrenaline that dumps all at once the reason that I burn out so fast? Note: I'm also Anemic.