We’ve all heard the advice before a big exam or nerve-wracking event: “take a deep breath.” It might sound simple, but this age-old guidance is rooted in science. In fact, controlled deep breathing is one of the most accessible tools we have for improving both mental and physical well-being.
So, what actually happens when you take a deep breath, and how can we use this tool more consciously to manage stress? In this blog, we’ll explore the science, its benefits, and practical ways to put it into practice, covering:
Table of Contents
The benefits of deep breathing
Let’s explore why deep breathing is so helpful for both our body and mental health.
1. Regulates the Autonomic Nervous System
Our bodies are controlled by the autonomic nervous system (ANS), which regulates vital functions like heartbeat, digestion, and breathing without us having to think about it. The ANS has two main branches. One is the sympathetic nervous system that is activated during stress, triggering the “fight or flight” response (fast heart rate, shallow breathing, tense muscles). The other is the parasympathetic nervous system, which helps us recover, often called the “rest and digest” system.
When we’re anxious, the sympathetic system tends to dominate, leaving us in a constant state of alert. Deep, slow breathing helps switch the body back into parasympathetic mode, signalling safety and calm. Scientists call this state physiological coherence, when breathing, heart rate, and brain activity work in sync. In this state, we feel more grounded and more able to handle challenges.
2. Reduces heart rate and blood pressure
One of the most visible signs of stress is a racing heart. Unfortunately, this can create a vicious cycle: the faster the heart beats, the more anxious we feel, which in turn speeds up the heart further.
Deep breathing provides a way to break this loop. Numerous studies show that slow, diaphragmatic breathing can lower heart rate and reduce blood pressure. By giving the heart a chance to slow down, deep breathing not only brings immediate relief but also supports long-term heart health.
3. Helps regulate emotions
Breathing deeply doesn’t just calm the body; it helps regulate emotions too. By focusing on the rhythm of our breath, we anchor ourselves in the present moment and interrupt cycles of worry. This is why many therapeutic approaches, like cognitive behavioural therapy (CBT), use breathwork as a core technique.
Research also suggests that controlled breathing may help release neurotransmitters such as dopamine – the brain’s natural “feel-good” chemical. Over time, regular practice can reduce symptoms of anxiety, depression, and anger.
4. Enhances focus and mental clarity
In today’s fast-paced world, maintaining focus can feel like a constant battle. Controlled breathing techniques provide a simple but powerful way to sharpen concentration and improve clarity. By deliberately slowing the breath, we reduce internal “mental noise” and create space for deeper thinking. A mindful pause can mean the difference between rushing into a mistake and taking the time to make a thoughtful decision.
Using deep breathing for exams
Exams can be one of the most stressful experiences for students, but deep breathing is a tool they can carry into the exam hall. Just a few minutes of breathwork before a test can help: one study suggests that as little as five minutes of deep breathing can boost performance.
In the exam itself, taking a slow breath before turning the paper over or before answering a tricky question gives the brain a chance to reset. One study found that students who paused before answering often reached the correct solution more efficiently, likely because the pause gave them time to choose the best strategy.Even after exams, deep breathing can be helpful. Not every student will achieve the results they hoped for, but failure doesn’t have to be final. A steady breath can provide the moment of calm needed to reflect, learn, and plan the next steps. This small act helps turn setbacks into growth, building resilience for the future.
Deep breathing techniques to try
The beauty of breathwork is that it doesn’t require specialised skills or equipment. Here are two simple methods you can try right now to see the effects of deep breathing first hand:
1. Box Breathing (or Square Breathing): This technique is favoured by everyone from Navy SEALs to teachers for its ability to calm the nervous system.
- Step 1: Inhale slowly through your nose for a count of four.
- Step 2: Hold your breath for a count of four.
- Step 3: Exhale slowly through your mouth for a count of four.
- Step 4: Hold your breath again for a count of four, then repeat the steps again
2. The 4-7-8 Breathing Technique: Developed by Dr Andrew Weil, this technique is known as a “natural tranquiliser for the nervous system” and is particularly helpful for relaxation and sleep.
- Step 1: Inhale quietly through your nose for a count of four.
- Step 2: Hold your breath for a count of seven.
- Step 3: Exhale completely through your mouth, making a whoosh sound, for a count of eight.
Final thoughts
Taking a deep breath may sound like simple advice, but behind it lies a wealth of scientific evidence. For students facing exam stress, it offers not just short-term relief but a lifelong skill for managing challenges. By teaching and encouraging breathwork, we can help students approach stressful situations with greater calmness, clarity, and confidence.
So next time your students, or you, feel overwhelmed, pause for a moment. Take a slow, deep breath. It might be the simplest step towards better well-being.
