The quickest way to the heart actually IS through the stomach. According to archeological evidence, the Aztecs basically discovered through their years of sacrificing people that it’s way quicker to cut open the stomach and then go up and under the rib cage to cut the heart out, rather than trying to break open the ribs to get through them. They could apparently get someone’s heart out this way in only a few seconds, and there are accounts of sacrifices where multiple thousands of people had their hearts cut out in a single day, which would take forever if they didn’t know the quickest method.