Sorry mate I don't mean to pick arguments with you, I simply disagree on some of the things you say. I'm also a level 3 qualified PT but have also spent years researching bodybuilding sites etc as that's what I used to be into year ago before I discovered mma.
The pec is most certainly not a group of seperate muscles, only pec major and minor, you do not have to do incline, decline and whatever else to fully develop the pec. Doing so you are merely hitting the muscle from different angles.
I must also point out that doing close grip diamond press ups wont ' improve your triceps and pushing strength immensely ' like you say, as its a high rep endurance excercise. A friend of mine can do around 100 press ups off the bat, I can do about 50. Does that means he is way stronger than me ? Course not, he just has better upper body ME from doing them more often. I can bench press a LOT more than him as I train low reps for strength.
Fair enough whack an INCREASINGLY heavy load on your back whilst doing diamond press ups and yeah for sure your strength will increase. You would be much better doing close grip bench though.
I shall await the thoughts of somebody more knowledgeable than both of us but I feel you are wrong and need to open your eyes a bit, you seem very level 2 book knowledgey...if that makes sense. ACSM guidelines and all that.
I just typed pectoralis myths into google and look what came up .....
http://www.wannabebig.com/training/b...yths-exploded/
Read the very first one....Oh dear.