Researchers think this simple exercise may help lower blood pressure — and you can do it at home

Wall sits are a great way to finish a leg day or strength-training session when you're trying to really fatigue your quads. Your legs are burning, you're counting down the seconds, and you're probably wondering why you decided to add one more set.

But there's another reason this deceptively simple exercise is worth keeping in your routine.

Wall sits are a form of isometric exercise, meaning your muscles work hard to hold a position without actually moving your joints. Researchers have been studying this type of exercise for its potential effect on blood pressure, and a new UK trial has taken a closer look at how often you need to do it to maintain that effect.

The findings could be particularly interesting if you don't have much time to exercise.

What the new trial found

Researchers from Canterbury Christ Church University and collaborating institutions studied 100 adults with an average age of 37. They had normal to high-normal blood pressure and were not regularly doing structured exercise.

For the first four weeks, 80 participants followed a lower-body isometric exercise programme three times a week. Each session involved four two-minute bouts, with two minutes of rest between them.

After those four weeks, the researchers split the participants into groups that continued exercising three times a week, reduced their sessions to twice a week, reduced them to once a week, or stopped altogether.

The first four weeks had already produced a significant drop in systolic blood pressure — the top number in a reading — of about 9.5 mmHg compared with the control group.

Then things got interesting.

What happened when they exercised less often?

After another four weeks, the people who continued exercising three times a week had the largest reduction in systolic blood pressure (the first or top number in a blood pressure reading).

The once-a-week group still had a lower reading than at the beginning of the study, while the group that stopped exercising saw its earlier improvement reverse.

In other words, cutting back didn't erase all of the change straight away. But exercising more often preserved more of the benefit.

The researchers found that the three-times-a-week group also maintained more of the changes in measures related to blood-vessel resistance and the nervous system.

It's an important distinction: the study wasn't testing whether someone could start doing one wall sit a week and immediately get the same effect. Everyone in the exercise groups first completed four weeks of training three times a week.

Why might wall sits affect blood pressure?

Wall sits are isometric exercises, meaning your muscles work without your joints moving.

While you're holding the position, the muscles in your legs contract continuously. That temporarily affects blood flow through the working muscles. Researchers think that repeated isometric training may eventually improve how the blood vessels regulate resistance, helping resting blood pressure come down.

The idea isn't entirely new. A large 2023 analysis of exercise trials also found that isometric exercise can produce meaningful reductions in resting blood pressure.

The new trial adds another piece to the puzzle: how much training may be needed to maintain those changes when life gets in the way.

How to do a wall sit at home

You don't need any equipment.

Stand with your back against a sturdy wall and walk your feet forward. Slowly slide down until you're in a seated position, then hold.

The research protocol was fairly demanding: four two-minute holds, with two minutes of rest between each one.

That doesn't mean you need to start there. If you're new to wall sits, begin with a higher position and shorter holds, then gradually work your way up.

Keep breathing normally throughout the hold rather than holding your breath. A sturdy chair nearby can also give you somewhere to sit if your legs give out.

Who should check first?

This study involved relatively young adults with normal to high-normal blood pressure, so its results shouldn't automatically be applied to everyone with hypertension.

If you have diagnosed high blood pressure, heart disease, a significant knee problem or take blood-pressure medication, speak with your doctor before starting a demanding isometric exercise routine.

Wall sits are also an addition to a healthy exercise routine, not a replacement for prescribed medication or other treatment.

For now, the takeaway is fairly simple: if wall sits are already part of your workouts, there's a little more reason to take them seriously. And if time is your biggest excuse for skipping exercise, researchers are finding that even a few minutes of static work can be worth investigating.