A Paleo diet also known as the Stone Age diet has the same food our hunter-gather ancestors ate such as fruits,meats,seafood and nuts. The diet lessens the body's glycemic load, has a healthy ratio of saturated to unsaturated fatty acids, increases vitamin and nutrient consumption and contains an optimal balance of protein, fat and carbohydrates.
During exercise, many chemical changes occur in the body, including a drop in blood ph, which can be very serious. how is the body able to cope with such changes?
The body is able to cope with such changes because the body's metabolism becomes more active, causing the body to require more oxygen (which leads you to breath faster and deeper)
Neck and head, I believe. The vertebral column is your spine
So you wont get germs that will spread to others