Lionel Sanders says 'These days make up most of my days just because of my training volume. I would certainly not plan on a yellow day to do something crazy high intensity. You certainly can do a bit of your low intensity stuff, as well and your technical stuff, like you do on a red day - but you also have to work a bit, so it's a great day to do more of your race pace specific work, which isn't super crazy taxing but also isn't super easy. I think it's a good day to plan more sweet spot or mid type intensity workout if you have an intense workout plan for that week.'
*From Zwift 1.49 (early October 2023), Zwift has decided to reorganize its workout library into new collections. Use More workouts like this to find identical workouts in new workout collections or training plans in Zwift. Workouts that are no longer available in Zwift can be downloaded from the official Zwift forum. See more info here: FAQ: How do I obtain and use old Zwift workouts that are no longer available in Zwift?.