Looking for long Z2 with sweetspot intervals workout

Training
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although im not ready for this kind or duration of ride yet, in the future im looking to replace one of my long zone 2 days with a z2 with ss intervals. i currently ride 6.5hrs/wk and im hoping to build up to 10hrs+ over the next 6months to a year. i do a 2hr z2 and a 2.5hr z2. as i slowly add duration and become accustomed to it, i want to add sweet spot intervals into one of those longer rides each week. for example a 3.5hr ride would be 2hrs z2 60-70%, 30min ss 90%ish, 10min recovery, 30 min ss then back to z2 for remainder. i dont see anything in workouts that caters to this kind of ride. do any of you do this sort of ride? how do you fit it into your TR schedule? outdoor isnt an option unfortunately. i live in an undulating area with way too many stop starts. thanks for any input. ps id love to see some sort of workout creator feature on TR. maybe AI could review and grade the workouts we create.

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There are some Tempo ones that are closer to what you want. The long SS have a lot more sweet spot than you want.

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Ive not found any, I create my own and drop them into TR

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TR Workout creator.

https://support.trainerroad.com/hc/en-us/articles/115003204386-Workout-Creator

Thread about SS progression.

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The closest I could find off-the-shelf was Spruce +2. It’s at 85% though & the Z2 isn’t as long as you want, so you’ll have to increase the workout intensity & extend the cooldown. You won’t get recognition in your Z2 PL but AT & FTP detection will know you did extra.

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great suggestion thank you

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Yes, that is a common and very effective structure for long endurance builds. Most people do exactly what you described, steady Z2 for the bulk, then one or two sweet spot blocks when already a bit fatigued. In TrainerRoad you can either extend an endurance workout and manually insert SS intervals, or just ride Z2 and switch to resistance mode for the intervals. It usually replaces one long Z2 day, not an intensity day. Outdoors is often easier for this if you have a long steady stretch, but many do it inside by breaking it into segments.