Your target muscle is latissimus dorsi.
Starting point: the seventh cervical vertebra to 12 thoracic vertebra and all lumbar spinous processes.
Stop point: humeral tubercle
Function: When the shoulder joint is abduction, adduction, pronation and fixation is far away, the trunk can draw the upper arm closer, which can assist inhalation.
Instruments: high-risk pull-down and long-distance pull-ups
Pure hand tour, you can ask me if you don't understand.