You're not having much luck with your knees are you?
I hope it all goes well with you & the ride as it must be quite a battle to regain fitness.
Nope, they're on the way to being knackered and cycling is one of the reasons (for the left a big reason as first buggered coming off a bike)
I just use the exercise bike in front of the TV, I'll get back in the gym to mix it up, I went for a walk earlier etc. Distance is as much about the mental as physical, hence not overthinking it. The long cycles I've done in the past (several 100+ km, a hundred miler) have done without any specific training or preparation (other than going to Poundland for the Haribo jelly babies). I take it easy, stop as needed, have cake and lunch breaks, I'm not racing. Rain is the one thing that dampens my spirit, not because of the wet per se, but because I get very cold and take forever to warm up again.
I am in the process of engaging a cycling focused physio to get me rehabbed and back on the bike, that'll help with mental and physical hopefully. I hope to be back out there in a few weeks if the surgeon is happy when I see him tomorrow
I've come back to cycling from surgery pretty much every year for the last 5 or 6...
2010 - knee ops in Feb and December (following injury in Sept 09)
2012 - elbow op in November (that was a crazy year, I spent about 100 days travelling for work too)!
2013 - minor elbow op in August
2014 - pretty much emergency surgery on infected shin in Feb
2015 - latest knee op (Feb), and I may well need something doing to the other at some point next winter
...so I've got the rehab to cycle down pat. I just have to be really careful not to overdo it, hence wanting professional help from someone who has a focus on cycling!