Participants will perform aerobic exercise three times per week for 8 weeks, with each session consisting of 30 minutes at 40-59% of heart rate reserve (HRR). Each session will also include a 10-minute warm-up and a 5-minute cool-down.

Enrollment will be measured by the proportion of eligible breast cancer survivors who provide informed consent to participate in the study. The proportion of enrolled participants will be reported.

Adherence will be measured as the proportion of exercise sessions completed by consented survivors out of the total of 24 prescribed training sessions. Completion of at least 18 of the 24 training sessions will be considered adherent.

Retention will be measured by the percentage of consented survivors that completed the research study compared to the total number initially enrolled. The proportion of survivors who completed the study will be reported.

This test measures how stiff your arteries are (called pulse wave velocity). Pulse wave velocity is an important measure that can help predict the risk of heart and blood vessel disease. It is a simple, non-invasive test, which means it does not involve needles or anything that goes inside your body. We will use a device called the SphygmoCor XCEL to do the test. To measure this, we will place a small sensor on your neck (over the carotid artery) and a blood pressure cuff on your upper thigh (over the femoral artery). The cuff will inflate slightly while we record your pulse waves. We will also use a tape measure to find the distance between the two spots.

This measurement will be conducted on three occasions: before the intervention begins (Visit 1), and after the 4th (Visit 2) and 8th (Visit 3) weeks of the intervention.

Participants will be asked to wear a blood pressure cuff on your arm with a small monitoring recording pack (ABPMpro device). The machine will take a blood pressure measurement every 15-30 minutes while they are awake and every 30-60 minutes while they are sleep. Participants will wear it everywhere, except for in the shower, for a full 24 hours. The 24-hour ambulatory blood pressure test gives a reliable measurement of the blood pressure, which is an important way to check your heart and blood vessel health This measurement will be conducted on three occasions: before the intervention begins (Visit 1), and after the 4th (Visit 2) and 8th (Visit 3) weeks of the intervention.