Pecs, with emphasis on the upper and middle chest fibres.
Best In Workout:
You can use this move as a pre-exhaust exercise preceding the compound presses necessary for mass, or you can put this last in your workout to flush and pump the muscle full of water, blood and nutrients.
Sets & Reps:
Perform 3-4 sets with 15-20 reps
Grasp a D-handle attached to the low cable and place your non-working hand on the same-side hip. Similar to the single-arm overhead press, using only one side of the body will help engage and recruit more stabiliser activity than you typically experience. As your core fatigues, you can hold the opposite handle in the non-working hand, helping you anchor and balance yourself.
Place your feet slightly wider than shoulder-width apart and tighten your abs. Standing halfway between the two low cables with a wide stance provides a stable foundation.
Stand up straight and keep your working arm slightly bent. You should work to keep that slight bend in your elbow fixed throughout the entire set. Doing so will help focus the attention on the chest fibres. If you open and close the bend in your arm, you will lessen the effectiveness and shift some of the focus off the chest and onto your arm.
Range Of Motion:
Pull the handle up and across your body. Bring the handle all the way across so that at the end of the range of motion, the handle is in front if the opposite shoulder. During the typical cable crossover, the handles meet in front of your chest or face, but working one side at a time allows you to cross your body, engaging more pec fibres for a longer ROM before returning to the start position and repeating.