In this work we discuss about the ideation and simulation of a lower body exoskeleton which will be used to help people with complete paralysis of lower body. Many diseases like ALS (Amyotrophic lateral sclerosis), Hemiplegia or paraplegia do not make possible to maintain the normal functionality of the legs and people became unable to walk. Nowadays, many exoskeletons model were made to help patients to restore lost functionalities, but it is a complex task. Human body is formed by hundreds of muscle, bones, and ligament; height and weight is very different from person to person, so as the needs of every patient.