1. #1
    Musclechemistry Site Representative Board Certified MD
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    Default Inner chest separation.

    • Magazines, Instagram posts and those charts at the gym are all guilty of showing you how to target your "inner" chest that highly desired pec separation on your sternum that shows a distinct canyon separating the two pectoralis major muscles. Well, the people telling us this missed a few anatomy lectures. To get to the bottom of this myth we have to look at the "all or nothing" principle. This human physiology principle states that once a motor neuron sends its impulse for the muscle fiber to contract, the entire fiber that's innervated by that same neuron must contract in its entirety. A fiber must contract 100% or not at all! Think of it like a gun. Either the trigger goes off... or it doesn't. There's no in-between.
      .
      The fibers have an obvious line of pull all the way from the center (sternoclavicular origin) to the insertion just beneath the deltoid (intertubucular groove insertion) with no interruption. If you fire the inner chest, you fire the whole fiber. Every sarcomere of fibril will contract on the entirety of that fiber. Remember, we can't selectively contract parts of one fiber.
      .
      What does this mean for you? Work angles of incline/flat/decline with different rep ranges and tempos to target different fibers. You can still improve the appearance of your upper/lower chest using different exercises and angles to get a good solid squeeze and induce hypertrophy in certain regions of the pecs. Just don't expect to work the middle without working the whole fiber from a lateral to medial perspective. Want that canyon on your chest to pop and have separation? You'll just have to get leaner.

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    Lots of truth to that. Thanks for the share!

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    I have started doing a new exercise that really hits this area. It is like standing cable flies but you bring the handles to your chest then push them out, extending your arms. You have the tension from the cables pulling and then pushing as you extend your arms. It is a killer.
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    I'm going to do that one it sounds great. I'll let you know how it goes. Thanks
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    I did them last night and I am very sore this morning. The pump was unreal.
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