body_proportions = [
    { 'height_inches': 63, 'height_cm': 160, 'weight_lbs': 150 },
    { 'height_inches': 67, 'height_cm': 170.2, 'weight_lbs': 160 },
    { 'height_inches': 70, 'height_cm': 177.8, 'weight_lbs': 171 },
]