Hi, i'm not completely sure I understand the question that you are asking. If you are asking for a medical condition that affects blood flow in the heart - Coronary heart disease.
This puts an increased strain on the heart, and can lead to: angina – chest pain caused by restricted blood flow to the heart muscle, heart attacks – where the blood flow to the heart muscle is suddenly blocked., heart failure – where the heart is unable to pump blood around the body properly. Which if untreated can lead to death.
I have posted the link to the NHS website with some great info on it.
This is an example of intensity change because he is deciding in one moment to add stretching his arms over his head to each set and it is referring to extreme strength, force, and energy.
He is adding more because he wants to make the transformation and strengthen his muscles. The person who is doing exercises can measure his intensity with heart rate and age.
Get Ana to watch Mickey and Dora, they can make learning fun for children her age and watch it with her too. Alternatively, just be patient with her, and guide her through reading.