Plain and simple, massive pears with hip/butt shelves, saddlebags, and really extended guts that stick out and almost look melted as they grow outward, just to make a fatty as wide and sluggish as possible through any enviroment
Also mutual weight gain with 2 girls, one acts as a feeder and the other as feedee but the one who is feeding the other begins to gain weight to making it a struggle for her to move around as much as the other fatty, to the point one ends up barely mobile and the other is completely inmobile pile of fat.