I'm starting training for my first tri (olympic) that's in july. I'm a cyclist, and also training for 2 early-season centuries, each with almost 10k feet of climbing, so I don't want to sacrifice any miles on the bike until at least the first one (May 10). I'm confident I could complete any combination of 2 olympic length events, since I used to swim competitively (but 6 years ago) and can pound out a 6mi. run (it may be ugly, but I can do it). If I start doubling up workouts (swim + bike, swim + run, etc..) after my 5/10 century, should that be enough time for an athletic, in-shape 25 year old to be competitive? (I want to do decent, not just finish...)