A couple of months ago I had lost a lot of fitness following a long layoff, partly due to injury and then the poor weather.
The week before the lockdown I bought a turbo trainer and have been alternating my riding between 1.5 hour road rides one day and 45 min turbo sessions the next. I don't like the turbo, but I must admit this regime has made a noticeable improvement in my stamina and speed (except one day the week before last when I went for a ride with my rear brake partly engaged
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In the 90 mins I am now going about 2 miles further and averaging 15 mph on a ride with quite a lot of climbing (not that impressive I know but quite good for me), and I have lost 5lbs.
As someone in the vulnerable age category I am sticking to the guidelines, but I can't wait till this lockdown is over (please let it be this summer) and I can get out on my favourite rides in the Brecon Beacons again to test myself against the bigger hills.