Full distance Ironman training

Quick question I’m currently doing the base phase of the full distance triathlon plan.Although I’m quite enjoying the training and not finding it over taxing,I find I’m spending a lot of my time in zone 3 for heart rate and power.I always thought the “golden bullet” for endurance training was to spend a lot if not most of your time in zone 2 to build the aerobic base for the hard work ahead.My concern is that once I reach the build and speciality phase I will be “burnt out” especially with hopefully the swimming pools open and the increase in running.Your views please

A post was merged into an existing topic: The Ironman Training 2021 Thread