Vital capacity is the maximum volume of air a person can expel from the lungs after a maximum inhalation. This measurement indicates how well the lungs can expand and how effectively the chest wall functions. Age, sex, height, and physical condition determine the baseline value for each individual. Values typically range between 3.1 and 4.8 liters for adults without respiratory conditions.

Increasing this functional capacity relies on training the respiratory muscles and improving chest mobility. Lung tissues do not have their own muscles. The movement of air depends on the diaphragm, intercostal muscles, and accessory muscles of the neck and back. If there is an underlying condition such as asthma or chronic obstructive pulmonary disease, consulting a pulmonologist is essential before starting any exercise protocol.

Definition of vital capacity and residual volumes

The respiratory cycle consists of individual volumes of air. Tidal volume is the amount of air that enters and leaves during a normal, quiet breath. In an average adult, this volume is approximately 500 milliliters. Inspiratory reserve volume is the extra air you can inhale forcefully after a normal inhalation. It typically corresponds to 2.500 to 3.100 milliliters.

Expiratory reserve volume is the air you can forcefully expel after a normal exhalation, which is about 1.100 milliliters. The sum of these three values equals vital capacity (Vital Capacity - VC). However, there is also residual volume (Residual Volume - RV). This is the air that always remains inside the alveoli, even after the deepest possible exhalation. Residual volume is usually 1.200 milliliters and prevents the collapse of the lungs.

When we train our breathing, we do not change the physical size of the lungs. What we alter is the ability of the muscles to compress and expand the rib cage. In this way, the amount of stagnant air at the base of the lungs decreases, and the functional space for oxygen and carbon dioxide exchange increases.

Standing intercostal muscle stretches

The intercostal muscles are located between the ribs. They are divided into external intercostals, which lift the ribs during inhalation, and internal intercostals, which draw the ribs downward during forceful exhalation. When these muscles are stiff due to a sedentary lifestyle or poor posture, the chest cannot fully expand. The following stretches restore range of motion to the rib joints.

To perform the side stretch, stand upright with your feet shoulder-width apart. Raise your right arm vertically overhead. Place your left hand on your hip for support. Slowly bend your torso toward the left side, keeping your pelvis steady in place. At the point where you feel tension in the right ribs, inhale deeply through your nose for 4 seconds. Aim to direct the air right into the side being stretched. Exhale slowly for 6 seconds. Repeat 4 times on each side.

The second stretch focuses on the front of the chest and the pectoralis major muscles:

• Stand with your back straight and clasp your hands behind your hips with fingers interlaced.
• Straighten your elbows and draw your shoulders back and down.
• Gently lift your hands away from your body without hunching your neck.
• Take 3 full inhalations, keeping your chest lifted.
• Relax for 15 seconds and perform 3 more repetitions.

These exercises should be done daily, preferably in the morning. They help restore mobility in the joints between the sternum and the ribs. If you experience sharp pain in the sternum or a muscle spasm, stop the movement immediately.

Three-part deep breathing protocol

Three-part breathing is a method of dividing lung volume into three anatomical sections: lower (diaphragm), middle (ribs), and upper (clavicles). The goal is full mobilization of the pulmonary lobes. Most people use only the middle or upper section, leaving the bases poorly ventilated.

Sit on a chair with a stable backrest and both feet flat on the floor. Place one hand on your abdomen and the other on the upper chest. Empty all the air from your lungs with a long exhalation through your mouth, as if blowing out a candle.

1. Filling the base: Inhale through your nose for 2 seconds, sending the air low. The hand on your abdomen should move forward, while the hand on your chest stays still. This activates the diaphragm.
2. Filling the midsection: Without exhaling, continue inhaling for another 2 seconds. Expand your ribs outward to the right and left. The chest now begins to expand laterally.
3. Filling the top: Continue inhaling for 2 more seconds. Lift the upper chest until you feel your collarbones move slightly upward. The lungs are now full to their maximum limit.
4. Exhaling with resistance: Purse your lips and exhale all the air steadily for 6 to 8 seconds. The abdomen draws inward at the end of the process.

Perform this cycle 6 times in a row. Take a 1-minute break of normal breathing and repeat for another 6 cycles. If slight dizziness occurs, stop the exercise. Dizziness indicates hyperventilation and a drop in blood carbon dioxide levels.

Using breath holds at full capacity

Holding your breath after a maximum inhalation increases intra-alveolar pressure. This process forces alveoli that normally underperform to open. It is also called alveolar recruitment. In addition, it increases the tolerance of the brain chemoreceptors to changes in gas levels.

The method requires a safe environment. Never practice breath holds in water, while driving, or while standing. Sit in a comfortable armchair or lie on your back with a pillow under your knees.

Take two calm preparatory breaths. On the third breath, take a maximum three-part inhalation as described above. Once the lungs are completely full, close the glottis (the back of the throat) without clenching your jaw. Hold your breath for 10 seconds at first. As your endurance improves over several weeks, the time can increase to 20 or 25 seconds.

During the hold, keep your shoulders relaxed. Do not allow the chest to collapse. When the time is up, do not release the air explosively. Exhale slowly through your lips for 6 seconds. Perform 4 repetitions with a 45-second break in between. This technique is not recommended for individuals with cardiovascular conditions or a history of heart problems without medical approval, as it temporarily increases chest pressure.

Tracking progress with a flow meter

Measuring lung function at home is done with two essential tools: the peak expiratory flow meter (Peak Flow Meter) and the incentive spirometer (Incentive Spirometer). The first measures how fast air is exhaled, while the second measures the volume inhaled.

To use the peak flow meter, stand upright. Make sure the indicator is at zero. Inhale as deeply as you can. Place the mouthpiece between your teeth and seal your lips around it without blocking the hole with your tongue. Blow out as hard and fast as possible, with a single sharp effort lasting one second. Note the number. Repeat 3 times and record the highest value.

Keep a log in a notebook or app. Record the date, time, and reading in liters per minute. A steady increase in readings over a period of 6 to 8 weeks indicates improved lung tissue compliance and muscle strengthening. If you notice a sudden drop of more than 70 liters per minute from your usual average, contact a doctor.

Common mistakes in breath training

Breathing seems like a simple process, but performing high-volume exercises involves technical errors that reduce results:

• Lifting shoulders during inhalation: Many people raise their collarbones instead of using the diaphragm. This fatigues the trapezius muscles and only fills the upper lungs.
• Forced exhalation with throat tension: Excessive clenching closes the airways before the expiratory reserve volume is emptied. Exhalation should be steady, not jerky.
• Excessive frequency without rest: Continuously doing exercises without breaks causes hypocapnia (drop in carbon dioxide), causing hand tremors and dizziness.
• Irregular practice: One hour of exercise on Sunday does not yield results. The respiratory muscles need 10 minutes of daily practice to build endurance.

Practical next steps

Start today by recording your baseline. Obtain a simple analog peak flow meter from the pharmacy. For the next 3 days, take measurements morning and evening without doing any exercises, so you know your average.

On the fourth day, integrate the routine into your daily schedule. Dedicate 5 minutes in the morning to intercostal muscle stretches. In the afternoon, perform 2 sets of the three-part breathing protocol and finish with 4 breath holds. Follow this routine for 4 weeks.

If a feeling of chest comfort, wheezing (whistling breath) or intense cardiovascular well-being occurs during the exercises, stop immediately. These exercises improve physical function, but they do not replace clinical diagnosis or support for the body from a specialist pulmonologist.