Unknown Story

I am lifting weights! This is my first time lifting, it is slightly difficult. 
I just finished lifting weights. I feel my blood pumping and I feel good! I feel as if i'm getting stronger!
I have been working out for a while now, every time i work out I feel stronger and my muscles are becoming more developed!
This guy here has just started working out, his cardiac muscle hasn't really developed yet. When you first start working out your muscles are forced to work harder to get more oxygen to your body. This is one of the reasons he feels so tired. 
The circulatory system works with the muscular system by pumping blood and oxygen to the muscles that are working. His cardiac muscle is working to pump blood from his heart which gives the feeling that his blood is pumping after he is finished working out. The more he works out his bones are adapting to his muscle by building more bones and becoming denser. This increases the bone strength and mineral density so that your body can continue to work out and you can become stronger.
When you work out more often more benefits come from it, overall it improves the muscle's ability to pull oxygen out of the blood, which reduces the need for the heart to pump more and more blood to the muscles.  Since she works out so often her lungs and heart work harder to supply more oxygen because it is needed for her body, overall makes her heart and lungs stronger since they have to work harder.

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