LOL - Yeah. It’s amazing anyone actually completes more than one genuine VO2max block.
I suggest changing the nomenclature and approach. Rather than getting wound up about VO2max, just say you are working on your short term power. That’s much more mentally attractive and a lot more fun than VO2max. As a bonus, if you do a block or two of short power work, your power numbers for 1, 3, 5 minutes will very likely go up. Since almost everyone here has a power meter, you can see the improvement as you hit new max numbers. Feels really good to see a new max number and that builds enthusiasm to keep working. Compare that to puking in a bucket for three weeks then wondering if your VO2max actually improved, not seeing an FTP bump because VO2max blocks don’t immediately translate to FTP, and being disappointed. So much of what we do is about being excited and seeing results so we come back for more!!
Since 5 min max has some correlation to VO2max, folks that go deep into this stuff can make some approximations if they really want to…
FWIW, and I’ll be an outlier here, a few things:
(a) I think most amateurs make a big mistake of playing a short game instead of a long one when it comes to improving. A season is a short game. Multiple years (seasons) is a long game. Come fall, riders playing the short game are tired of training and think they need a break. They don’t. They go off and do other stuff and get distracted for several months and end up losing a lot of the cycling specific fitness they built. They go from peak back to trough. As we get older, those peaks are less high and the troughs are deeper.
When we take a break then come back to it, we have to regain all of the loss to get back to where we were. It would be better to keep going and play a long game. You can’t hold a peak, particularly in winter, but you can minimize the depth of the trough. Trough is a nice way of saying the hole you have to dig yourself out of!! It perhaps doesn’t help that the industry caters to “time crunched” riders and produces plans meant for one season at a time (short game) rather than taking riders on a longer journey. As a motivated rider, you’ll have to do some work to link your seasons together and play the long game.
(b) For cyclists, Weightlifting and Core work should be year-long components of a fitness plan. It won’t help you be faster on the bike in an obvious and immediate way. But over time it will help. Besides, 99.9% (internet fact checked number) of us are hobbiests. We ride for fun and satisfaction. Take a couple hours a week total to be healthier and your older self will love you for it. The time to start strength and mobility training habits is not at some magical age like 50, 55, 60 - it is TODAY. Don’t do this for just 8 or 12 weeks a year - do it year round.
(c) Leg work in the gym for 8-10 weeks a year is a waste of time in terms of improving you on bike power long term. You’ll just get DOMS and a short period of squats and deadlifts will likely not translate to being a faster cyclist. If you can’t incorporate those movements into a year-round plan, then I don’t think it’s worth the effort for 2-3 months. Something different than riding which I do think does translates to the bike is rowing on an erg. Rowing is a great exercise, it translates to the bike for me, and has nice bang for the buck in terms of using time efficiently. It’s great for folks with hard winters stuck inside.
(d) My days of doing 2, 3, 4 hours several times a week on the rollers are gone. While piling on endurance time during winter “base” makes a lot of sense, its mentally something I’m not gonna do. For winter, if committed to the bike, I actually like the mid-volume type plans. 45-90 min per workout and HIT or Sweetspot heavy. If I do that for 12 weeks, along with my regular weights and core, then when the weather breaks and can get outside, will switch it up to a more polarized, endurance type program. That has worked pretty darn well (when I’ve followed the plan and not been lazy). It is also mentally satisfying and doable. By the end of the HIT/SST focused blocks I’ve had enough of that and am ready for a ton of endurance work outside along with some very focused hard days or races.
$0.02. YMMV. Etc. Etc. Etc.