Zone 2 bike training for long distance triathlon

We often get triathletes asking us about lower intensity, or aerobic  bike training.

Should I really be doing it when training for 70.3 or Iron distance triathlons?

Would I not be better to go harder to maximise the training effect for the limited bike training time I have?

Coach Rob explains the purpose of lower intensity Zone 2 rides, the impact it has on fat burning, and why that’s useful for longer distance races.