Blood Pressure... Stress can cause blood pressure to rise above optimal levels because it is the fight/flight response that triggers adrenaline.

The force of blood against the inside walls of your vessels plus your blood vessel's resistance to blood flow create blood pressure. If blood pressure is too great, it can damage the vessels and restrict blood flow to vital organs.

The adrenaline rush that is experienced in a stressful situations is an automatic self preservation mechanism. Adrenaline is what constricts blood vessels in the body under stress at the blood vessels in muscles dilate to protect you from real or perceived danger.

Body'Fit pH Fitness exercise is designed to change the action of adrenaline from constriction to dilation so that blood pressure is more evenly distributed throughout the body, ie it lowers pressure on the vessels to compensate for the increase in pressure as heart rate increases during exercise.