Over the course of four sections this PhD examines the ways in which the Aristotelian, Stoic and Epicurean philosophers portray bodily activity. In particular, it argues that their claims regarding bodies' natural tendency to preserve themselves, and seek out the goods capable of promoting their well-being, came to influence Hobbes's and Spinoza's later accounts of natural, animal and social behaviour. The first section presents the ancient accounts of natural and animal bodily tendencies and explores the specific ways in which the Aristotelian, Stoic and Epicurean views on animal desires came to complement and diverge from each other. After investigating the perceived links between natural philosophy, psychology and ethics, the section pro...