Hypertension affects more than 25% of all UK adults and many people are not even aware of it.
The condition, which is also known as hypertension, increases stress on blood vessels and on vital organs.
It also increases the chances of developing some deadly complications, including heart attacks and strokes.
But it could reduce the risk of hypertension by playing more tennis, it was stated.
Tennis is a good exercise choice for hypertensive patients, as it is an aerobic and repetitive activity, said Blood Pressure UK.
Sport uses rhythmic movements while working on the largest muscle groups in the body, he said.
All patients with hypertension should try to incorporate more exercises into their workout routines that help the heart and blood vessels.
"Different types of physical activity and activities have different effects on your body," said the charity.
"Aerobic activity is the type that helps your heart the most.
"Aerobic activities are repetitive and rhythmic movements (exercises) and use the large muscle groups of your body, such as those of your legs, shoulders and arms.
"Walking, jogging, swimming, dancing and digging are all aerobic activities.
"Other forms of activity are less useful, for example, you should not do any very intense exercise for short periods of time, like sprinting or lifting weights."
Intensive exercises can rapidly increase blood pressure, which puts the heart under unwanted stress, he said.
Talk to your doctor before starting any intensive training. Some exercises, including scuba diving, actually require a medical certificate before starting.
But most people with high blood pressure should be able to increase their levels of physical activity safely, provided they choose the right exercise.
Hypertension is often referred to as "the silent killer" because many people may have hypertension without even knowing it.
The only way to know if you are at risk is to check your blood pressure.
But if you have extremely high blood pressure, there may be telltale signs that you are at risk.
Symptoms of hypertension include severe headaches, epistaxis and difficulty breathing.
See a doctor or pharmacist to have your blood pressure checked. All adults over age 40 should check their blood pressure at least every five years.