The Forgotten Rib Cage The rib cage is the forgotten workhorse of the upper body. Shoulders have vast ranges of motion in all planes and allow many forms of dynamic movements, from all four swim strokes to throwing a baseball. The shoulder has become its own subspecialty in medicine and performance. The lumbar spine is itself multibillion dollar industry from low back pain to six pack abs. The thoracic spine has recently garnered much attention for its role in upper body mobility.