Selena currently participates in weight training three times a week but would like to increase her cardiorespiratory fitness level. which fitt principle does she need to adjust to reach this goal? time frequency type intensity

The amount of oxygen that is actually used by the body during the rest or a hand workout is determined by the heart rate, the stroke volume, and the amount of a. blood circulating in the vascular system b. oxygen removed from the vascular system c. oxygen provided to the vascular system d. blood that individual has in the body e. hemoglobin in the red blood cells