peregrinator wrote:The majority of the exercises use equipment I don't have, so I'd really like to know how effective are those exercises which use only body weight and stretches?
Very, very effective, if you do them right. But if you're not experienced with "exercises" vs "activities" then I can understand that it's daunting

I used to do a lot of weights training at the gym with a trainer, and if you were interested then I'd suggest that's a good thing to do. The magic words to tell the people at the gym are that you're interested in "functional fitness" and that you prefer bodyweight exercises that you can do without lots of equipment. They should be able to match you up with someone who understands that, who can show you the drill.
However, if you don't want to do that (and I can completely understand that, as it's a very different sort of activity!) then I would just say to keep doing lots of the sort of walking that makes you sore, and you'll get more used to it over time

Then you can build up to do something a bit harder, and keep on challenging yourself from there.
As someone else said upthread, DOMS is caused by micro-tears in the muscle, which is perfectly normal and is how you build muscle and strength... the body will heal those tiny microscopic tears so they're a bit stronger than they were to start with, and that's how we improve over time. As long as you're not causing "macro" tears then there's no real harm done, other than staggering around and saying "owww" a lot for a day or two afterwards. For that, there's ibuprofen as I said
