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I had massive knee problems after tearing my ACL playing rugby when I was a teenager. I had a PT friend who really helped me work on my mobility, particularly the hips actually, and they've been great ever since! Might be worth trying a good PT who's focussed on sports and mechanics mores than glamour muscles if you did want to give it a good shot!
I also found the proper shoes made a huge difference for me, I'd been running in the wrong ones for years until I did the whole gait analysis bit and bought the shoes recommended by the running shop and they were a game changer!
I'm definitely looking forward to hauling 15kg less around with me though... When I was proper fit a few years ago I once did 30 pull-ups with a 20kg weight on a weight belt and I struggled to do 10 this morning on an assisted pull-up machine set for 57.5kg... dark times!
Nahguavkire-
I had torn meniscuses on both knees, with surgery needed on the right knee, due to kicking things too hard, so repetitive percussive shock can make my knees really sore.
Also I have short extra wide flat feet, that I've never been able to find comfortable running shoes for.
Trying some Vivobarefoot shoes, as I've always found being barefoot more comfortable, likely due to spending thousands of hours doing martial arts.I did 100 pushups (Chris Heria 10 reps of 10 different types) on Monday in addition to Taekwondo, it currently feels like my chest muscles want to tear off my sternum. Very sore.
Used to be able to to multiple sets of 50 pushups back in the day. Something, like the pull ups that should get easier with a bit less weight to push.
Acliff
Running will definitely be kinder on your knees closer to 80kg!
I've always wanted to do a marathon, for the bucketlist, rather than hoping I'll be good at them, but my less than perfect knees and feet would crumble in the training running up to one.