Before revision: Narrow, shoulder-width dips only train the triceps, with major synergists being the anterior deltoid, the pectoralis muscles (sternal, clavicular, and minor), and the rhomboid muscles of the back (in that order) .
After revision: Narrow, shoulder-width dips mainly trains the triceps, with major synergists being the anterior deltoid, the pectoralis muscles , and the rhomboid muscles of the back .