I love a niche question! If you want to start a bodybuilding workout routine, I suggest this e-book, Target Body Building (https://bit.ly/bcl-target-bodybuilding). If you are more interested in learning about the history and culture of bodybuilding, I’d suggest A genealogy of male body building: from classical to freaky by Dimitris Liokafto ((O’Neill Library Call # GV546.5 .L48 2017) or Women of steel: female bodybuilders and the struggle for self-definition by Maria R. Lowe ((O’Neill Library Call # GV546.6.W64 L69 1998)