What's the best exercise to work the bottom part of the pectoral muscles?

[Ranger X]

The declined bench is all I know of but it hurts my shoulders when I do this exercise.

 

[StageLeft]

You may not need to work them. They get a lot of work from other excercises, especially flat bench press or db press. I never, ever work mine. Just flat and incline.

 

[ojai00]

Have you tried decline dumbbell flyes or standing cable crossovers? You should have your palms facing up and pulling from the bottom towards the top.

 

[Aharami]

decline dumbells is good. if your shoulders are hurting, try doing lower weights till you get used to it.
i used to do it...but now i go to the gym by myself...no spotter..so i just do cable crossovers. not as effective, but its something
also, dips help

 

[TheNinja]

decline press, decline machine, cable crossover, dips. These are your best bet. And I know what you mean about shoulders hurting. Just remember when you are doing decline press you want to push straight up (like a plumb line was hanging down). What also helps me is to not get your elbows so far below your shoulder line. People will probably bitch and moan about how you aren't going all the way down, but elbows just below shoulders works great for me and saves my shoulders. This is especially true for those of us with relatively thinner chest and long arms.