Haha, well first off I have been hobbling about all day after my first day yesterday, stairs are torture xD That's because I haven't really been working on my legs at all recently so all the jumping has really ripped up my thighs
For the past couple of years I've just been going for walks a few times a week, I also did a lot of "plank"s and ab crunches during that time because I wanted to work on my core. I did some occasional running (cardio has generally been a weak point for me) but kinda screwed up my knee trying to jump from a sprint and overextending it or something. I started going to the gym last December and doing a mix of running and weights - which has ended up being mostly weights because I decided I needed to give my knee more of a rest. It was fine yesterday so that's good, I've been reading the Parkour Handbook and it's made me reailse my knee is probably just generally aggravated by stuff like poor landing technique when I've been jump around on stuff, down stairs etc, so hopefully if I just take it easy and learn to land well then it will stay good
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Again as a result of the
PK handbook, I'm going to change my gym sessions to involve probably lower weights and higher reps to try to condition my tendons and ligaments. I didn't know they take longer to condition than muscles, but now that I know that, some things from training before are starting to make sense
I'm also going to start pulling weights *down* the way with my arms straight, because while I can push-up my weight fine using my triceps, I found it crazy difficult to get myself from a cat position to where I was able to push-up yesterday without using my elbows as levers, which apparently is bad form!
And finally I'll start doing proper squats.. I've never really liked them but it'll obviously help loads for
PK 
Don't know how much weight I'll be able to squat yet but I'll take it easy until I get the technique down (and also cuz my left knee makes a weird noise when I squat, even tho it was the right one that I hurt last year.. I'm a mess).
End essay.
PS Ben, I'm pretty sure I ripped my chest muscle after landing hard on an icy pavement a few years ago.. I stopped doing pushups to give it a break too, but it kept hurting every so often for like 4 years, mostly when doing stuff like lying down with my arm under my head. The time it actually started getting better was when I started doing Choi Kwang Do. They did loaaads of yoga stretching before and after classes, and that's around the time when my chest started feeling like it was actually improving. The light exercise may have helped too but obviously you don't want to overdo it.
The stretch that I felt was best was where you'd kneel down, with your toes/balls of your feet on the floor and your knees slightly out to the side to stabilise yourself. Put your fingertips to the side of your head so that your elbows are sticking out horizontally. Then lean down to one side so that one of your elbows is sticking up into the air, and look up towards that elbow. If you ripped the same part of the muscle as I did then that one should help stretch it out, though you should take it easy at first until the muscle gains some flexibility. That stretch sometimes still gives me a little pain but my chest has stopped hurting in normal situations.
Of course, I'm not a Physiotherapist or anything, but I hope this helps you to recover quicker than I did, and going to see a Doctor can't hurt