It’s a funny part of (mostly female) human behavior (mostly female): Pear-shaped ladies wish they had better legs, and apple-shaped lassies wish they had the abs of a pear. Oh, how the grass is always greener on the other side. But if you ever thought that your genes were to blame for your body shape and there was no way that you wouldn’t end up looking like your dear mother later in life, think again. New research shows that personal choices and environment can still have a significant effect on your body. Sure, 80 percent of your size comes down to genetics, but that extra 20 percent is a lot for you to tweak to make you your best you.