decline press help also?
Somewhat yes, but a rotary exercise in this case will allow for a greater total range of motion. Allowing the muscle to stretch, and contract with full range. This also involves stabilizer muscles that surround, and connect to the pectoral muscle. Decline fly's are another option, better imo than decline presses.
better for lower chest development in general or only in this case of side of lower pec?
Somewhat yes, but a rotary exercise in this case will allow for a greater total range of motion. Allowing the muscle to stretch, and contract with full range. This also involves stabilizer muscles that surround, and connect to the pectoral muscle. Decline fly's are another option, better imo than decline presses.
Are dumbell flies helpful as well?
Cable crossovers coming from highest setting on dual pulley, pushing down, and in front of you while crossing your arms at the around the waist. Focus on the pec muscle, and not pulling with your arms. Squeeze the chest muscles at the end of the concentric phase of the exercise. Maintain slow controlled movements, with strict form, and not going too heavy.
maybe decline bench, but mostly it's just genetics.
the lower part of the pectoralis major, called the sternocostal part, attaches to your sternum (breast plate).
From Wikipedia:
"It has two different parts which are responsible for different actions.
The clavicular part is close to the deltoid muscle and contributes to flexation, horizontal adduction, and inward rotation of the humerus. When at an approximately 110 degree angle, it contributes to abduction of the humerus.
The sternocostal part is antagonistic to the clavicular part contributing to downward and forward movement of the arm and inward rotation when accompanied by adduction."
So if you're looking for lower chest, decline presses, pec flies, and Idontknowwhattheyrecalled's (standing at a lat pull-down machine, arms straight out grabbing bar, pulling bar towards waist, no bend in elbows)
If you are a body builder and need to work on lower pecs, cool and good luck. but if not then focus on the main lifts and eating, but genetics has a lot to do with it. Some people can never build calves.
Dips!
Dips!
do dips and lean forward while your doing them. theyre good to hit the lower pec hard, leaning forward adds more emphasis on the lower pec instead of the triceps.