Regular exercise can decrease your blood pressure and increase the health of your heart and arteries. However, exercise makes you heart pump faster and work harder, and if you have hypertension your heart already has to work harder. Therefore, initially your exercise should be monitored closely by a physical therapist to make sure there are no complications. After initial monitoring, you will be able to exercise independently. At this stage, a physical therapist will help design an exercise routine that fits your needs, your goals, and your lifestyle.
Here is a helpful link with more information about hypertension: