1. Start With A Multijoint Upper-Chest Movement
The simplest and most obvious solution to emphasize your upper pecs is to target them first on chest day. So, instead of starting your workout on the flat bench, start with the incline bench press.
By flipping exercises, you’ll find that you’re significantly stronger and can lift a little more—or do a few more reps with a given weight—than you could when you did an upper-chest move later in your workout. Forcing your upper pec fibers to lift more than they’re accustomed to will set you on the road to making gains.
By all means, since you’ll now be a little stronger on inclines, don’t be afraid to use a slightly more challenging weight.Nothing stalls progress more than choosing a weight you can already handle for 3 sets of 10. If you normally do sets of 8-10 with inclines, do a set or two (after warming up) for 6-8 reps to make those fibers work even harder.
There are benefits to doing either a barbell or dumbbell movement here, and both are good choices. You may find that the following points will help you decide which to opt for as your lead exercise, but you definitely want to steer away from a machine exercise. Your body has to work harder—and harder work equates to more muscle stimulus and growth—with free weights.