RL goes to his cardiologist and is surprised when his bloodwork shows that he is at increased risk for heart disease. Even though RL is at a healthy body weight, his doctor still says to start walking at least 30 minutes per day for 5 days a week. Which of the following will be an effect of regular exercise that reduces heart disease risk?
a. Triglycerides will rise
b. Diastolic blood pressure will rise
c. HDL will rise
d. Systolic blood pressure will rise