What is a good way to improve stamina?
Recently, I have developed a habit of smoking shisha(flavored tobacco) which is most obviously going to make my breathing a little more difficult. I also noticed prior to this I just cant run for a long period without getting winded. I am not a husky guy or chunky by any means. I just want to know how I can prevent myself from getting so tired and be able to participate 100% instead of having to take a breather after giving it my all.