As a result of regular physical activity, which of the following is considered an improvement in cardiovascular and respiratory function?
a. Reduced resting systolic/diastolic pressures
b. Reduced total body fat and reduced intra-abdominal fat
c. Increased serum high-density lipoprotein cholesterol and decreased serum triglycerides
d. Increased maximal oxygen uptake resulting from both central and peripheral adaptations
Answer: D