Extreme Bodies looks at dwarfs and examines how certain genetic conditions can result in people who are much smaller in height than average. Ir uses MRIs and computer to take a look at how dwarfism can affect bone growth and interviews several athletes who compete at high levels despite their dwarfism. It looks at several different conditions including hypochondroplasia, achondroplasia, and primordial dwarfism. It also examines the controversial practice of limb lengthening.