Sandow built his physique to the exact proportions of his Grecian Ideal , and is considered the ` father of modern bodybuilding , as one of the first athletes to intentionally develop his musculature to pre-determined dimensions . Sandow built his physique to the exact proportions of his Grecian Ideal , and is considered the father of modern bodybuilding , as one of the first athletes to intentionally develop his musculature to pre-determined dimensions .