Seated Machine Chest Press
Why it’s on the list: Free-weight pressing moves on a flat bench are great, but the machine press has some unique benefits. For one, it’s easier to slow down the repetition, both in the concentric and eccentric phases. Stack-loaded machines are also great for quickly doing dropsets.
EMG research demonstrates that the machine bench press recruits much less of the three heads of the deltoid (anterior, middle, and posterior) than free-weight variations because of a decreased need for humeral stabilization.This allows you to really target your pecs.
In your workout: Again, do machine exercises at the end of your workout. For anyone looking to build mass, machines give you a greater chance to pump your pecs with minimal shoulder assistance.