What type of training targets the large muscles of the body to increase oxygen demand?

Cardiorespiratory training focuses on improving the efficiency of the cardiovascular and respiratory systems by engaging large muscle groups in rhythmic activities that increase heart rate and oxygen consumption. This type of training often includes activities such as running, cycling, swimming, and aerobic dance, all of which require significant energy expenditure and enhance overall aerobic capacity.

Muscular strength training, while important for building muscle and strength, primarily focuses on improving the force production of muscles rather than significantly increasing oxygen demand during prolonged activities. Flexibility training is centered around enhancing the range of motion of joints and does not specifically target cardiovascular or respiratory improvements. Balance training is aimed at enhancing stability and coordination but does not directly address the oxygen demand in the same way that cardiorespiratory training does. Thus, cardiorespiratory training is the correct choice for targeting large muscle groups to elevate oxygen demand effectively.