Dynamic stabilizer: Biceps Brachii (short head only)
Mechanics: Compound
Force: Push
Starting position
Place a flat bench under the bar of the Smith machine so that after you lie down the bar will be able to descend to your upper chest/throat/chin region.
To prevent the bar from being able to injure your person by dropping too low, secure the safety pins of the Smith machine.
Lie on your back (supine) on the bench and grasp the bar using a pronated (overhand) shoulder-width grip.
Spread your legs and plant your feet flat on the floor for stability.
Unlatch the bar from the rail by rotating it.
Execution
Keeping your elbows high and approximately 45 degrees out to your sides, inhale as you carefully lower the bar towards your upper chest/throat/chin, stopping when your forearms make contact with your biceps.
Exhale as you press the bar back up to the starting position.
Repeat for the prescribed number of repetitions.
After you have finished, rotate the bar to latch it back on to the rail.