Heat Neutralisation

Blood is under pressure in the arteries so that it reaches all parts of the body. Diet, exercise and other factors can affect the risk of heart disease developing.

Blood pressure
Arteries carry blood away from the heart. Blood in the arteries is under pressure because of the contractions of the heart muscles. This allows the blood to reach all parts of the body. You can see how the heart pumps the blood to the lungs and rest of the body by studying this animation:

Measuring blood pressure
Blood pressure is measured in millimetres of mercury, mmHg. There are two measurements:

systolic pressure - the higher measurement when the heart beats, pushing blood through the arteries, and
diastolic pressure - the lower measurement when the heart rests between beats
A young, fit person should have a blood pressure of about 120 over 70, which means their systolic pressure is 120 mmHg and their diastolic pressure 70 mmHg.

There are various factors that can increase blood pressure, including:

smoking
being overweight
drinking a lot of alcohol
stress.
A balanced diet and regular exercise can reduce high blood pressure.

Blood pressure - Higher tier
Extremes of blood pressure can create problems. High blood pressure can cause:

kidney damage
burst blood vessels
damage to the brain, including strokes.
Low blood pressure can cause dizziness, fainting and poor blood circulation. Fitness versus health
Fitness and health are not the same thing:

fitness is the ability to do physical activity
health is the amount of freedom from disease.
Fit people are able to carry out physical activities more effectively than unfit people. Their pulse rate is likely to return to normal more quickly after exercise.

Healthy people are free from disease and infection, but they may or may not be fit as well. It is possible to be fit but unhealthy, or healthy but unfit.

Measuring fitness
There are different ways to measure fitness. Factors include:

strength...