Maybe the 110 pounds thing is partly due to her tiny T-rex arms that cannot cross over her boobs. According to the internets, one human arm weighs on average 6.5% of total body weight. For a 130-pound person (which is still quite thin for Anita's physique), that's 16.9 pounds for both arms. So let's say her arms are each 2% of her total body weight instead. She still must have a virtually non-existent waist and hardly any fat on her thighs, which likely looks very strange considering her big booty.