Hello. I am from a poor area of South Eastern Europe and I am interested in obtaining a very strong, slim and nimble physique.
Due to my material situation I don't have access to sturdy doorways(or good building construction quality for that matter), sturdy furniture nor even a branch of hanging pipe as anything that is not bolted to the ground gets stolen and sold/burned(for heating, cooking and else). Hell even things bolted to the ground get stolen with time, bolts included. So I do not have the material conditions necesary to do pullups or dips.
What I do have and have seen a reliable number of times in my life is concrete(although cracked) floors. More specifically the floor of the entrance hall to my commie block as the match box sized apartment I live in is too small for me to fully spread myself on the floor.
FYI I am an 18yo male of 172cm tall with a weight of 55-60kgs. I am in the 12th grade and I have a bunch of things on my plate, from chronic health problems(which interfere somewhat with fitness) to family problems(which necesitate I sell what belongings I can to obtain money for after I finish highschool) and other troubles.
So the question arrises, what can I accomplish by doing calisthenics using only the floor?
I have heard of the book "Convict Conditioning", is it of use in this predicament I find myself in? Would there be a more complete alternative/s ?