I’d recommend asking this question in the Ironman 2019 Thread to get some great advice from the smart folks in there
Here’s the link:
Generally, the High Volume Plan is already a lot of training stress, so adding additional rides should be done with great caution. Be sure to listen to your body and if you have any hint that you are not recovering enough from week to week, cut that ride out. It’s better to be able to nail all of your workouts at a lower volume than to start burying yourself in fatigue at a higher volume.
