Training ideas are only useful when they still make sense on a real day. Weather, fatigue, terrain and the rest of the week matter more than making a screen or a plan look perfectly completed.
The question behind unhappy intervals x2 is what changes in practice. The useful answer is usually found between what this session is for and stop or reduce the session: the point where a broad idea becomes a choice that can be made, observed and revised.
A demanding session for experienced weeks where the standard workout is well understood and a larger volume of repeatable work is appropriate.
Warm up, complete the first full sequence, take the saved reset, then repeat before cooling down. The current version is around 10 km and 43 minutes of structured running.
How it should feel
The first set must leave room for the second. If the opening repetitions feel maximal, the target is wrong for the day.
Create separate warm-up, work, recovery and cool-down steps so the watch handles the transitions. Use effort, heart rate or pace targets only where they genuinely help; leave flexible steps open when terrain or conditions should guide the run.
Use the standard version, complete part of the second set or make the inter-set recovery longer. The doubled version is not a default progression; it belongs where the rest of the week can support it.
Treat this as the main hard session of the week. Easy running, riding or rest should protect the days around it.
End the session if pain changes your movement, symptoms feel unusual, conditions become unsafe or the effort is clearly wrong for the day. Shortening a workout can protect the purpose of the week. This is general training information, not medical advice.
The purpose of the session matters more than completing every line exactly. A useful plan can be shortened, slowed or moved while still protecting the reason it was included in the week.
That is the standard I would use when returning to unhappy intervals x2: keep the reason visible, make the next decision small enough to understand, and leave enough evidence to know whether the approach is still helping.