Half Ironman Recovery Weeks

Hi all, I’ve got a question about recovery weeks in the half Ironman plans (low volume). I’m struggling to actually be sure that there is a recovery week every four weeks. Every four weeks is seems there are two weekend rides. I’m just not understanding how the more volume is a recovery week? I realise that some of the weekly workouts are easier, but the weekly TSS doesn’t seem to drop in the recovery weeks.

I’m a few weeks into low volume build and have noticed the same thing. I’ve just taken it day to day. If I’ve got nothing left in my legs I’ll swap in an endurance or recovery ride. I’ve been skipping pettit as well. With my schedule I had to put them on my only rest day and would much rather do some yoga and/or stretching.