YSK that "Rub your chest, your arms will take care of themselves" was made up and does not work. During this cold winter periods, don't get life-saving advice from Batman. Christopher Nolan made this up and it does not actually work.
from /r/YouShouldKnow
YSK说的 "揉揉胸口，手臂就会自己照顾自己 "是编出来的，并没有用。在这个寒冷的冬季时期，不要从蝙蝠侠那里得到救命的建议。克里斯托弗-诺兰编造的，实际上并不奏效。