I would “get my affairs in order” before trying 5 in a week 
well if you replace vo2max with sweet spot, and the first week is done for 5 weeks in a row before taking a recovery week, you have TR’s SSB HV plan.
I’m referring to research of Ronnestad, where he achieved better response to vo2max wo. I am thinking of doing it after my threshold block after a proper rest week. The first week is brutal but the other weeks seem doable ( 1 hard week, 2 easier weeks followed by rest)
yes I figured you were, however since this a SS thread thought I would add an observation about TR SSB HV that I made long ago.
Not block periodization but I posted about a vaguely similar vo2 overload block here:
@RONDAL:
here are my notes from that webinar:
Find power at 15 minutes before TTE. Set this as power reference point [PRP].
Work intervals at 95 – 105 per cent of PRP for weekly TiZ of 10 – 15 per cent of weekly volume.
With 2-3 intervals, progress to 150 per cent of TTE in each workout.
So in your case, TTE = 60 mins. So, PRP = power at 45 mins. I can’t read this off the graphs you provide, but say that is 300 watts. Then the interval power targets are 95-105% of 300 [285 - 315 watts]. Progress to the point where you can in 2-3 intervals do 150% of TTE [90 mins] at this target in each workout.
That’s my understanding and what I am planning to do, starting next week. I hope that this is a correct interpretation.
I like the Advanced Interval Targeting view and there’s a chart in there (it’s called something like Donny’s Interval Targeting char)that has interval targets based on your PDC and desired interval length. I found that more useful than the difficult to understand recommendations from Tom’s older webinar.
I posted the Donny interval one in my original post
You have the same “issue” as I expressed though, are you targetting different power targets for different time periods, or the same target power and working to extend that out.
My understanding is: same target power; work on extending it out to 1.5 x TTE.
Sorry, I was looking at my phone, didn’t see the graph you posted. I wasn’t using different power really because it’s one or two watts different for a 20min vs 25 or so. Just kept it and extended time.
I did that last year. Started off already in december-19 and continued that “cycle” all the way into May. I decided to try that approach since I hadn´t really done any proper structured training for several years (have a background as a junior national team orienteerer) and felt/knew that I need to get my VO2max up (since the endurance part was sort of still there…).
Worked wonders for me (but then again, I´m that kind of athlete that responds well to HIIT, VO2max and similar training). Or at least if you compare the dec-19 numbers against june-20 (FTP up by 80W to 330W). However, I noticed that I was crushing it already in April (training races etc) but didn´t really improve that much after. Most likely because this approach leaves little time to work on your endurance (i.e. building that base) because you really need to look after your recovery.
For this year I have a bit different approach. Sep-20 to Dec-20 I did a 3month SST progression block to improve my TTE, muscular endurance etc. Now, Jan-21 to Mar-21 is my true base period with a lot of Z2 (pushing that LT1 higher) and gym work. Also slowly adding 1 threshold and 1 VO2max session per week so that my body is ready for the build block in April and May. With the knowledge and results from last year, my build period will be doing the block periodization twice. My A-race is in early June. I will be ready! 
ps. DJ has a YT video on exactly this block periodization. Check it out.
Edit: added FTP gains
Do you have a video title so I can search this. Please dont post the video because I dont think we want this devolving into another DJ thread.
there are several and you can search a YouTube channel by keyword and find stuff quickly.
Already did that, and as you have linked, its still not clear which video he was referencing as there are more than a few to choose from.
The video is titled how to get in the best shape you’ve ever been in: block periodization but on the “first page” you’ll se it named as “high risk high reward training”.
He also shows both which high intensity workouts he did during that first week and his training weeks after.
What I’ve read of this thread has been very insightful, so thanks to people who’ve contributed.
I’m coming to the end of SSBHV2 and I’m thinking about what to do next. The Plan Builder says Sustained Power Build, but I wonder whether I should do something different.
I’m also going to be riding a lot more outside on my TT bike, so it’s gonna be a big change from endless SS on the turbo!
Are you planning on racing this summer? If so, when is your A-race? And what is your A-race (TT I presume?)?
Know that CTT calendar is a bit up in the air, but have you got anything you’re particularly targeting?
Likewise, was there a particular limiting factor you felt at all last season (pacing, ‘surges’, position, comfort, equipment, etc.)?
I think I’ve realised the last couple of years that once your FTP is up to a certain level at the beginning of the season, in terms of performance, there’s probably far more to be gained by dialling in or focusing on other stuff than trying to squeeze out another 5-10w at threshold.
edit, will move the conversation somewhere else if needed, will try to keep on progressing on SS!
@TheFatSagan 100m TT in June; 10m TT in August. Few B races between Apr - Sep, and some Club 10s sprinkled throughout.
@jackkellam Last year I only executed two really good races; a lot of the others were erratic. I definitely didn’t spend enough time outdoors on my TT bike in position. I’m hoping to spend a lot of time on the TT bike in position, like I did in 2019, to really dial in what’s sustainable.
@4ibanez has experimented with modifications. Lookup the details starting here:
For ~10 hour week that would be around 60 to 90min of intervals. So @RONDAL maybe 2 days of intensity would be enough in your setup.
At least for me my n=1 experience and gut feeling says I would reach the final interval progression with less days of intensity per week (probably 2) and at the same time feeling better (less fatigued).