I’d first ask where you’ve been these last six months when we have an Ironman training thread right here
You only ‘need’ a few long outdoor rides to be ready for Wales. I think every triathlete benefits from having the indoor option available when trying to fit in xx hrs a week.
Workouts can be done by RPE outside, but it depends on whether you plan is TR or something else.
Plus, are you really an Ironman without a 4h+ indoor ride?
