So long story short. I had asthma when I was a kid and I couldn't do shit because I was living in a contaminated city (Stgo, Chile). After I moved to Miami I stopped being a fatass, began lifting, training MMA and got in shape. Still, my cardio is shit for athletic standards. I can run 5K, with maybe a crappy 26 min time if I run at night when is not that hot and wet out there. I have very flat feet so I think that affects my cardio while running so I feel I get tired a little sooner for the effort on my feet, but I feel I'm an ok swimmer and I can ride the bike pretty well (I have strong legs). I feel like improving and doing a super sprint triatlon. The numbers vary, but super sprint triatlons can be about 200-yard swim, 6-mile bike and a 2-mile run. Some are heavier with 250 yard Swim, 9 mile Bike, and a 5k Run with winners ending it after about 55 minutes. Personally I'd prefer those with numbers like 12 mil bike and 2 mil run, but whatever. Any tips on preparations? Obviously it's a lot about power this time, since the swimming and biking is done at a lot of speed. But to run a 6 min mile I tried to run 2 slow ones first, and so on. Cardiovascular activity for more than 1 hour is something else, and I don't wanna lose my muscles and my figure. How should I prepare?