Forearms
Attach straight bar to low pulley.
Sit on bench facing machine, or kneel.
Grasp bar underhand (palms up), shoulder-width.
Rest forearms on thighs or bench edge, wrists hanging off.
Lower wrists fully to stretch forearms.
Exhale, curl wrists upward, flexing forearms.
Squeeze at top.
Inhale, slowly lower wrists back to start.
Repeat.