Back and chest were the most popular in men, generally there was an attempt for symmetry because [some bullshit about balance]. In women, the back only because breasts got in the way. Arms and legs were generally uncommon because there’s a lot of movement there and a wide expanse of skin was better for minimizing extraneous damage. Also they DID actually know the abdomen was full of important squishy stuff so they were more hesitant to, you know, burn someone seriously there.