Three programs will get you from couch-to-Olympic. They are the Conservative and Aggressive based running programs plus the cycling part of Phase IV or VII respectively. Follow it by your choice of the 16 or 20 week sprint and olympic triathlon training programs. Also Michael Pate offers his proven program for the heavier athletes.
*No program here or anywhere else is perfect. Different programs work for different people. These programs are based on our opinions, research, our personal experiences and others experience. Please do your homework and look at other programs too (not just ours).
Try these combos:
Aggressive Run Program
Conservative Run Program
Michaels Total Sprint Program
NOTE - It may be beneficial for you to taper after your sprint program, take a week off, build back up and maintain your max sprint times for the duration of a month or two BEFORE continuing on to the olympic. The taper and 1 week off is for some needed rest. Listen to what your body tells you.