Welcome to the Get Fit Guys quick and dirty tips to get moving and shape up.

My name is Brock Armstrong and I am the Get Fit Guy.

Your chest muscles are important for many things, other than just filling out your t-shirt.

They are responsible for flexing your upper arm when you swim, or moving your arm inwards when you're

riding a bike, or rotating your arm bone towards your body while you walk or run, or also

for simply breathing deeply. And that's what we're going to talk about today. All right, before I

dig into the details of how you can get a strong and defined chest, I want to address a common fear that

exercising like this will make, well, women look like men and men look like balloon animals.

Well, to allay this fear, I'm going to turn to biology. All of us have a gene that's called

GDF-8, and that gene is in charge of a substance

called myostatin. Now, myostatin is in charge of controlling the amount of muscle we have on our

body and how big our muscles develop naturally. The base levels of myostatin and muscle in the majority of us make it impossible

for us to naturally build bulky muscles, no matter how heavy a weight we lift. And the majority

of us simply do not have the genes to build bulky muscles via any form of exercise. Now, there are a few people out there who can become bulky because, well, they have those bulky genes,

but they are few and far between, and no matter how much most of us engage in resistance training,

we will never cross that threshold that gives bulking up a bad name. Okay, with that out of the

way, let's talk about chest muscles. The main area of our chest is made up of two muscles that we

refer to as the pecs. These muscles work together to do the activities that I described earlier,

and these muscles are the pectoralis major and the pectoralis minor.

Now, the pectoralis minor is located directly underneath the pectoralis major.

Both of these chest muscles start at the clavicle, which is your collarbone,

and insert at the sternum, which is your breastbone,

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