To begin any exercise design to build the cardiovascular system, the exercise must get the heart rate up and must be done for at least twenty minutes, and most important of all should be very consistent at least four times a week.
During this time, hydration is very important especially on a very hot days. We have already discussed some of the ill effects of dehydration and these warning signs need full attention. Many people are in a state in partial dehydration and they don’t realize it. Hydration and exercise are not separated .