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Breathing increases after the first two minutes from normal to rapid. This is because ... TBC (Eva and Bri)

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your blood pressure varies throughout the day depending on what youre doing. the more active you are the harder your blood has to be pumped and this then causes the blood pressure to rise. normal blood pressure should rise during exercise and then return to normal once you are finished.
when your exercising your muscles need more oxygen. the heart then pumps more blood around your body with more powerful contractions which will make your blood pressure increase. your blood pressure increases  during exercise as the cardiovascular system delivers more blood to the working muscles

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a long term consequence of exercise on Capillaries is thicker, stronger walls therefore increase in stroke volume. The more blood pumped around the body per minute the faster oxygen is delivered to the working muscles. The number of red blood cells increases improving the bodies ability to transport oxygen to the muscles for aerobic energy production.

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Decrease in resting and working heart rate.  Your resting heart rate (RHR) is the number of times a your heart beats per minute while at complete rest. Resting heart rate will decrease as your heart becomes stronger with aerobic exercise training. A low resting heart rate is an indicator of good fitness. With a slower working heart rate, the heart's left ventricle has more time to fill with blood and more time to deliver oxygen/nutrients around the body - it is more efficient at meeting the boy's needs.

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Decrease in resting and working heart rate.  Your resting heart rate (RHR) is the number of times a your heart beats per minute while at complete rest. Resting heart rate will decrease as your heart becomes stronger with aerobic exercise training. A low resting heart rate is an indicator of good fitness. With a slower working heart rate, the heart's left ventricle has more time to fill with blood and more time to deliver oxygen/nutrients around the body - it is more efficient at meeting the boy's needs.

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The volume of blood that is pumped out by the heart per minute. This increases as your heart rate picks up also as your stoke volume increases. It is measured in mL. The benefit of having a increase in cardiac output is that the heart will have to beat less times per minute to release the sam amount of blood to the body.
This happens because the heart become bigger and stronger and is able to increase the cardiac output.

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Your body temperature rises because more than 70% of the energy that powers your muscles is lost as heat. but to keep your body temperature from rising to high, your heart pumps the heat in your blood from your muscles to your skin, you sweat and it evaporates to cool your body.

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Definition: Muscle hypertrophy involves an increase in size of skeletal muscle through a growth in size of its component cells.Two factors contribute to hypertrophy: sarcoplasmic hypertrophy, which focuses more on increased muscle gylcogen storage; and myofibrillar hypertrophy, which focuses more on increased myofibril size.

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Definition
The amount of blood ejected by the left ventricle in one contraction.

Stroke volume increases because; when you exercise, your cardiovascular system works harder. It needs to deliver oxygen to muscles, transport heat to the skin, transport hormones to meet metabolic demands and deliver nutrients and fuel to tissues. The volume delivered by each beat of your heart -- your stroke volume -- increases when you exercise to increase the circulating blood in your system so your body responds appropriately to exercise.

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At rest, only 15-20% of cardiac output is directed to skeletal muscle (the majority of it goes to the liver (27%) and the kidneys (22%). Blood is redirected to areas where it is needed most.
The redirection of blood away from areas where it is not needed (eg. spleen, kidneys) to areas where it is needed (eg. working muscles).
During exercise our heart rate increases causing the blood flow to increase and rise towards the skin, the increase of blood flow also allows more blood to go towards the skeletal muscles due to them working harder and needing the energy produced to allow them to work correctly and effectively.
Physical Activity

With exercise, metabolism speeds up and because of this the muscles require more oxygen

So the heart beats faster to supply the muscles with more oxygen-rich blood

In turn the speed of blood flow increases.

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definition: Tachycardia is a faster than normal heart rate at rest. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. If you have tachycardia (tak-ih-KAHR-dee-uh), the heart rate in the upper chambers or lower chambers of the heart, or both, is increased.
It increases due to high demands of exercise and teh flow of blood can vary.