The cardiovascular system essentially consists of the heart, a network of hollow blood vessels (called arteries, veins and capillaries) and the blood that fills them.
The type of cardio I want to share with you that fits in well with strength training is High Intensity Interval Training, or HIIT
In heart attack it is common that the pain is either very intense or mild. Its' intensity can veary a lot from case to case. One specific sign of a myocardial infarction is, as in the angina pain, the growth in intensity during the first minutes.
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