Machine Decline Press
Why it’s on the list: Some machines, like Hammer Strength, allow you to move each arm independently, which is a great feature on chest day. Besides doing a machine decline press straight on, you can sit sideways on the apparatus and press across your body one arm at a time, which delivers a completely different feel than when you sit straight-on.
One of the primary muscle actions of the pec major is transverse adduction—think cable flyes or pec-deck flyes to understand this action. By sitting in a sideways position, you can maximize your press with a pec-dominant horizontal adduction, effectively getting more from the movement.
In your workout: Do free-weight exercises first in your chest workout because they require more effort and stabilizer muscles than machines. With that in mind, this could be the last multijoint exercise in your routine.