Soldato
Just going to put this out there as I'm not really sure I know the answer... It's more training related so kinda aiming this at @BennyC as he's been quite quiet on here recently - but equally open to all!
With Zwift, I've used the Tour of Zwift and Racing quite a bit this winter/year to 'get myself back on track', without many/any outside rides around commuting. I've followed no plan (as usual!) and being time pressured have just fitted these rides in whenever I can. The way I've ridden these I've got quite used to riding at threshold for an hour (sometimes more). I know this isn't sustainable or repeatable on the road.
Now the weather is getting a bit better (jinxing it now), the chance of me making one of the local group rides is increasing, what else should I be looking at doing to balance out my training a little - rather than just hammering out threshold rides?
Or is hammering out an hour of threshold fairly good for a fitness perspective, so when I do a couple of hours group riding on the road at tempo I'm not going to be dropped hard!
Only a hunch, but I reckon you might be riding at heart rate threshold Z4 on the turbo with less noticeably less power than outdoors, because you aren't doing turbo rides often enough. Compare the power and heart rates over the best 20mins of my first proper session https://www.strava.com/activities/1939939001/analysis/245/1421 against what I did a month ago https://www.strava.com/activities/2064599849/analysis/138/1324 , an average of +69W for just +7bpm. Just like last winter, it took ~3 weeks of 3+ turbo sessions a week to get my body to adapt to turboing in our kitchen.
Not every turbo session needs to 60mins+ to reap benefits, loads of my sessions since November have been under 45mins and a fair few under 30mins... It's all about what you do in them.
Mix up power interval intensities and duration, giving yourself more recovery time between harder intensities, while climbing the Watopia radio tower climbs or Alpe Du Zwift. Not just at your current FTP, throw in some brutal 1-2min efforts that are 125%+ above FTP. Throw in a 20min power effort session, challenging your current best 20min effort once a week or so. Not only does this approach seem to be helping me improve, it also makes the training sessions far less boring than plodding away up RoadGrandTours' Stelvio Pass.