Would some individuals be able to share some reading material that can help this couch potato learn how to work back to enjoying these things again? I know many people in the HN community have gone through something like this, so I'm eager to here your (hopefully successful) stories.
Toughness is defined as the ability to resist stress (such as the stress caused by physical exertion).
The core premise of the book is that a regimen of progressive stress and rest is the path to toughness (increased physical endurance). Too much stress, physical or mental, requires increased rest, therefore you must experience some stress, but not excessive stress. This means finding the stress <-> rest equilibrium that results in the most benefit.
If you're asking for motivation, my only personal advice, having done this a couple times now, is that you must change your environment. Move to a city and give up your car, it will happen with near zero effort. I found walking to my favorite cafe and then my favorite view to be rewarding and self reinforcing.
You should also set your expectations appropriately. It takes 2-3 months of huffing and puffing before you feel much progress, and then one day, you realize "that wasn't so bad," and you will see your body has adapted.
Also, when people want to feel healthier, they often focus on movement but ignore diet. After a few months focusing on fitness, you start to understand that diet is 90% of the work and the physical activity itself is probably closer to 10%. That's if you want to lose weight or build muscle and it's especially true if you want to build muscle.
I also recommend getting a trainer for resistance training for at least 3 months. It is expensive but worth it. It allows you to outsource many different problems to someone else and lets you focus on the physical work directly.
Start cycling again - it's much easier for your knees, especially if you're overweight.
Thing is, most people (including me until 5 years ago) make a resolution that they will start training and diet and stuff - they go hard for 2 weeks, get injured, stop. Wait till next year.
This is not how it works - you need to set a long term goal, and go there progressively, very slowly in the beginning. Your goal for the first 6-12 months is simply consistency - show up every day - and you achieve that by training easy. But training everyday.
If you just start walking, and cycling a bit everyday - and you increase the distance or time by 5-10% per week, even if you start very low, you will be around a shape allowing you to run a marathon by the end of the year.
then slowly ramp up to weighted resistance
it's an uphill battle , 2k steps is nowhere near enough