I've never had any injuries but doing long hours siting all day without exercise has taken a huge toll on my back. I'm not overweight but my lifestyle is very sedintary :/ Long story short lately I've have my issues become so much that I've had trouble with simple things like putting on pants, getting in and out of the car, sometimes even sleeping. Have done lots of mris, xrays and months of physio and pain keeps coming back. Also religiously did the exercises prescribed by my doctor but nothing is helping.
I'm kind of like at that point in your 30s where even jogging for a block is a nightmare for me. But reading your story gives me hope. I'm 37 and just learning that taking health forgranted for work has been a big mistake.
I will try to research some cardio exercises that won't aggravate my pain and get started. I love your idea about doing things during code compilation. What a blessing in disguise that is. I already started that today doing some SI joint exercises that I can do while sitting. It's a start and I now to get involved with beginner cardio next.