Question: what do chin ups and pull ups work

title: Chin-up
text: Chin - up bars are playground equipment that were once ubiquitous on children 's playgrounds . They are still important in the adult equivalent of a playground , the Par course . A chin - up bar is simply a smooth horizontal metal bar , often a pipe , held solidly above ground by a wooden or metal frame . Typical installations include 2 or 3 different heights of bars for people of different heights . Chin up bars are also a part of a home gym setup . Types of chin - up bars include doorway - mounted , wall - mounted , ceiling - mounted and free - standing .