Endurance Training During Lockdown

At the start of this year I was focusing my training on endurance with the plan to complete several centuries over the summer. Whilst I'm not sure which events will still be on I still want to train towards getting some longer rides in at some point.
My normal week would involve three 1.5 hour rides plus a four hour ride on a Sunday at zone 2. During the current lockdown I can still get outside and ride but am not sure about doing long rides, especially alone. The most I'm planning to do is 2/2.5 hours in the local vicinity.
I have a smart trainer and am on Zwift but can't bring myself to go more than a hour and half.
My question is, how can I still train to improve endurance with a limit on longer sessions? I'm not working at the moment so I want to make the most of this opportunity to get myself in good shape.
Should I be doing lots of shorter zone 2 rides, does that work the same as doing one long zone 2 ride? Or should I be pushing myself into higher zones during these sessions?
My normal week would involve three 1.5 hour rides plus a four hour ride on a Sunday at zone 2. During the current lockdown I can still get outside and ride but am not sure about doing long rides, especially alone. The most I'm planning to do is 2/2.5 hours in the local vicinity.
I have a smart trainer and am on Zwift but can't bring myself to go more than a hour and half.
My question is, how can I still train to improve endurance with a limit on longer sessions? I'm not working at the moment so I want to make the most of this opportunity to get myself in good shape.
Should I be doing lots of shorter zone 2 rides, does that work the same as doing one long zone 2 ride? Or should I be pushing myself into higher zones during these sessions?
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https://www.bikeradar.com/advice/fitness-and-training/best-workouts-training-plans-zwift/
Not sure I have the mental fortitude to doing 20 mile loops either
There's a few workouts in the Zwift "TT Tune-Up" plan I was doing until I started to get ill during the plan's final week in late Feb, which are supposed to stimulate endurance power. I couldn't say if they work or not as I'm yet to test my endurance since.
https://whatsonzwift.com/workouts/tt-tuneup/
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
Not much will accurately replicate a long ride - since it trains your energy systems and toughens up your saddle area as well as training your legs and cardio.
This virus is only getting started. Minimise the risks to everyone.
This is a video of Naples yesterday... they are in full lockdown, enjoy... (skip the advert when you can)
https://video.repubblica.it/dossier/coronavirus-wuhan-2020/coronavirus-a-napoli-tanta-gente-in-strada-per-la-spesa-del-fine-settimana/357456/358016?ref=RHPPTP-BS-I252667351-C12-P4-S2.4-T1
My point is not much how badly they behave, but that the real problem is that we have to go out to buy food... here is not as bad, because it's mostly large supermarkets
However the risks are still very small: using the linked data (UK 2013 stats), the risk of being "killed or seriously injured" in a 5 mile ride is about 5.2x10^-6 (5.2 in a million), and for a 100 mile ride it is about 1x10^-4 (1 in 10,000). This still is a two order of magnitude difference in the risk of placing a demand on the NHS/emergency services.
Probably there are other factors to consider which don't show up in the data, such as if you live in a built up area the risk close to your house is likely to be higher than the risk in the middle of the countryside, so the 5 mile ride round your house might include all the most dangerous bits of the 100 mile ride (admittedly unlikely).
Also most cycling injuries tend to involve other vehicles, and there are far fewer vehicles on the road at the moment, which you would expect to affect the risk level.
I personally don't see the problem in going for a solo bike ride down some quiet back lanes, but really it's not my business what other people decide to do.
Can you do both to achieve a long ride. Ride as far as able outside and then jump straight on Zwift for another hour or so?
How about this, but the other way 'round i.e. do an hour on the turbo and then two hours (or whatever) outside locally?
and I climb hills so badly