Cables keep tension on your upper chest from bottom to top.
Drive the handles up and in, the inward angle is what loads the upper chest.
Pressing low-set cables up and inward traces the exact line of the upper chest fibres, which run from your collarbone down toward your arm and pull it up and across the body. Unlike free pressing, the cable stack never lets tension drop, loading the chest at the bottom stretch and through the squeeze at the top, with the shoulders assisting the upward drive and the triceps finishing the elbow extension. It earns its place as the constant-tension upper-chest builder in any cable setup.
Resistance profile. Dumbbells load the stretch hard but go light at the top, while cables from a low pulley pull down and back the whole way, so the squeeze at the top stays heavy. Cables also spare you wrestling weights into position.
Low, at or near the bottom of the stack. The upward angle from a low pulley is what creates the incline pressing line. Set them at shoulder height and you have turned it into a flat press.
Because the upper chest pulls the arm up and across your body. Letting the handles travel slightly toward each other at the top matches that line and finishes the contraction, something a fixed bar can never allow.
