Ill tell you guys something. Now I'm not a pro or even top amateur, but whatever chest size I have was built doing decline bench and dips.
Starting with my current prep though I wanted to change things up and stimulate the muscles a little differently.
Buselmo turned me on to Gironda style training. Two of his most famous exercises are the neck press and "Gironda" dips.
The neck press is done on a flat bench with a wide grip and elbows out wide, not tucked like a proper bench press. Lower the bar all the way down to where your neck meets your clavicles.
Now, you are going to have to lower your poundages cause this is not an easy exercise and I imagine it pits your pecs in a great spot to tear if you go to heavy, BUT by doing this exercise I have dramatically changed how my upper chest looks.
I also have recently started to develop good inner split/separation between upper and lower pecs. I feel that the gironda dips are the cause. They are hard to explain, but basically you want to take a wide grip. And have your elbows out to your sides. Tuck your chin to your chest and do deep dips.
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