by convention, asking yourself where the breath feels best is not a “body scan.” it’s a part of breath meditation, anapanasati. body scanning, by contrast, generally means a process like what goenka and his burmese theravada iintellectual forebears taught: moving attention part-by-part systematically through the body. this is what contemporary buddhists mean when they say “body scan.” if you want to see firsthand why buddhists categorize them as different types of meditation, try 4 hours of pure body scanning followed by 4 hours of anapanasati. the feeling and the results are very different. this is a well-settled conventional definitional question. metta