Heart size has little to do with body shape, but more to do with body shape. The heart is a muscle power organ that pumps blood in the human body. It weighs about 300 grams, accounting for about 0.5% of the weight of the human body, and the size is equivalent to my fist. Interestingly, its strength is often proportional to the strength of the fist. A rough person (mainly a manual worker) has a strong heart and a big fist.