@stino77
What @JoeX said works. Think of this as periodization, right? So you want race specific efforts as you build up to your goal event. Especially in Tri where we do fewer events overall, not like crit racers going every weekend… the caveat being, for ultra events like 70.3+ you need more time to do those race specific efforts because you are training for primarily aerobic benefit, and that takes time to adapt, unlike a crit racer or even sprint tri where you can extend TTE at threshold (sprint tri) or build anaerobic fitness (crit) in 2-6 weeks… we’re looking for longer term adaptations.
What I’d typically recommend is spending a good deal of time many months (like 6-8 months out) pushing that FTP up on the bike, develop swim technique and just keep run volume enough to maintain bone density and neuromuscular adaptations for running. Think like 15 min runs off the bike, maybe a 30 min or so every week. But you don’t need to be doing tons of run volume 8 months out. Do it on the bike instead, IMO.
So do your base, do a SST progression… I’d go to 90 min for a 70.3 athlete. Then hit VO2max on the bike. I would still do block style here, because it works… and you have time… and you just keep everything else very easy/simple. Then train FTP for 3-6 weeks after VO2.
Once FTP is UP, then you worry about pushing TTE at threshold and then race intensity OUT. So the shift goes from intensity on the bike SST->Vo2->Threshold->Tempo (for 3-4 months with some maintenance SST or threshold efforts if needed), to intensity on the run (Endurance → Threshold (when you switch to bike tempo for 1-2 months) → Race pace (till raceday). Swim is kind of separate and depends on the athlete, but always technique work, and heavy focus on things like endurance sets, then eventually 300s for “Speed” again when bike intensity drops off.
I typically have triathletes focus on growing one sport at a time and kind of maintaining the others. So it’s a lot of intensity focused in one sport at a time, which might take longer in terms of training adaptions but in my opinion you are way less likely to plateau for a long time this way.
That’s a general approach for people who have the lead time to their event to do it. If someone has a REAL weakness that’s holding them back, focus on that. But remember, triathlon is still at its core a bike race. If you’re not good on the bike, your run is going to be slower (more energy use on the bike) and everyone’s going to catch you after the swim anyway. If you have shorter lead time to your goal races, then you probably need to mix things up more, and that can work. I just always kind of hit a wall with that approach, where I’d max out at like 255W on the bike because I was trying to train all the things. When I was able to do more focused work, I could get up to 275-280W on the bike and still run fast. When lack of training time (on active duty) forced me to “mixed block” train and have relatively lower volume, I was stuck at like 235W… and guess why I didn’t qualify for Kona/Nice in my last 70.3?