HIIT can improve oxygen consumption

To provide oxygen and nutrients to your muscles, your heart pumps blood throughout your body. HIIT exercises can also maintain and even enhance your circulatory system, according to a number of studies.

For example, in a 2017 study, 26 schoolchildren were divided into two groups: one did HIIT training, while the other followed a more traditional workout regimen. Seven weeks passed throughout the trial. Compared to the typical exercise group, the HIIT group had more improvements in cardiorespiratory capacity, or the body's capacity to get oxygen from the heart and lungs, as well as greater fat loss. According to another study, those who did HIIT workouts for 20 minutes four days a week for five weeks increased their oxygen intake by 9%. Similar improvements in oxygen consumption were seen in the other trial group, which cycled continuously for 40 minutes per day, four days per week.