How can I increase my stamina for running?

Short answer: Running stamina builds mainly through consistent, gradual training, good sleep, nutrition and rest. Comfortable breathing matters too: a blocked nose or poorly controlled allergy can make easy runs feel harder than they should, and broken sleep can slow recovery. Running most easy miles at a conversational pace is a useful principle for many runners.

Key takeaways

• Stamina grows through regular, gradual training rather than sudden jumps.
• Most easy runs should be at a pace where you can talk in full sentences.
• Sleep and rest days are when much of the recovery happens.
• A blocked nose or uncontrolled allergy can make running feel harder.

Dr. Prashanth's perspective

In athletes who mouth-breathe, peak performance suffers. In my experience, their VO2 max dips because mouth breathing dries the airways and reduces oxygen absorption. Nasal breathing is vital for them to reach better performance and their goals.

— Dr. Prashanth R. Reddy, ENT Surgeon, ENTHealth360

What actually builds running stamina?

Stamina is built mainly by consistent, gradual training that the body has time to adapt to. Over weeks and months, regular running may improve how the heart pumps blood, how muscles use oxygen and how efficiently you move.

Many coaches suggest doing most of your weekly running at an easy, conversational pace, with a smaller portion of harder sessions such as tempo runs or intervals. Increasing weekly distance gradually may lower the risk of injury.

Recovery is part of training. Sleep, nutrition, hydration and rest days allow the body to repair and adapt. Without them, extra running may simply lead to fatigue.

What holds back stamina?

Several common factors can make running feel harder than it should:

• Running every session too fast
• Increasing distance too quickly
• Short or broken sleep
• Low iron or anaemia, which may reduce oxygen-carrying capacity
• Not eating or drinking enough around training
• Exercise-induced asthma
• A blocked nose or poorly controlled allergy, pushing you to mouth-breathe early

If your stamina has suddenly dropped without a change in training, or you feel unusually breathless, it is worth seeing a doctor.

What can you do to improve stamina safely?

A patient, structured approach often works well.

• Do most easy runs at a pace where you can still talk in full sentences.
• Build weekly distance gradually and include a lighter week every few weeks.
• Add one session of strides, tempo or intervals once you have a steady base.
• Include strength work for legs and core twice a week.
• Aim for 7 to 9 hours of sleep, especially before long runs.
• Eat a balanced diet with enough carbohydrates and protein, and stay hydrated.
• If your nose is often blocked, saline rinses and allergy control may make breathing more comfortable.

In Bangalore, early-morning runs can mean pollen and traffic pollution. On high-pollution days, a park or a later, lighter session may be kinder to your nose and lungs.

How are breathing, sleep and endurance connected?

Comfortable breathing supports both your training and your recovery. At easy paces, many runners can breathe through the nose, which warms, filters and humidifies the air. Mouth breathing at higher intensity is normal and needed.

If your nose is blocked, you may switch to mouth breathing even at easy effort, which can make runs feel more strained. A blocked nose may also make sleep lighter and more broken through snoring or mouth breathing.

Since deep sleep is when much of the body's repair happens, better nasal breathing may support steadier recovery and endurance gains over time.

How does nose breathing support energy and BMR?

Your basal metabolic rate (BMR) is the energy your body burns at rest to keep the heart beating, the brain working and cells repairing. Your cells make that energy using oxygen, so how well you breathe matters.

Nose breathing helps in two ways:

• Warm, moist, filtered air. The nose warms, humidifies and filters each breath before it reaches the lungs. Conditioned air is gentler on the airway lining, which matters in Bangalore's air-conditioned offices and traffic dust. Mouth breathing skips this step and can leave the throat and airways dry.
• Nitric oxide from the sinuses. The paranasal sinuses continuously make nitric oxide (NO), a natural gas. When you breathe in through your nose, small amounts of this NO travel to the lungs, where studies suggest it may help widen tiny blood vessels and improve oxygen uptake. Mouth breathing largely bypasses it.

Nose breathing does not "boost" your BMR. That is set mainly by muscle mass, age, body size and hormones such as thyroid. But comfortable nasal breathing by day, and undisturbed breathing at night, support efficient oxygen supply and deeper sleep, which your body needs to use energy well and recover.

A simple check: sit quietly and breathe through your nose with your mouth closed for two minutes. If that feels difficult, or one side is always blocked, it is worth having your nose examined.

When should you see an ENT or doctor?

Consider an ENT check if:

• One side of your nose is always blocked
• Allergies flare often and make running uncomfortable
• You snore or wake unrefreshed despite enough sleep
• You frequently get sinus infections

Stop running and seek urgent medical care for chest pain or tightness, fainting, severe breathlessness, or a racing or irregular heartbeat. Breathlessness that seems out of proportion to your effort should be checked by a doctor promptly.

How does an ENT evaluate and treat this?

An ENT checks whether your nose and sinuses allow easy, comfortable airflow. After discussing your symptoms and training, the doctor examines your nose and throat.

A nasal endoscopy, a thin camera gently passed into the nose, can show a deviated septum, swollen turbinates, polyps or allergic swelling. If snoring or sleep apnea is suspected, a sleep study may be advised. For breathlessness, your doctor may also suggest heart or lung tests.

Treatment may include allergy management, nasal sprays, or surgery for selected structural problems. The right option depends on the cause.

Frequently asked questions

Does nose breathing give me more energy? It does not add energy by itself, but it delivers warm, humidified air and sinus nitric oxide to the lungs, which may help oxygen uptake. Together with better sleep, that supports the energy your body uses at rest (BMR) and during activity.

How long does it take to build running stamina? Many people notice improvement within four to eight weeks of consistent training. Bigger gains in endurance usually take several months.

Should I breathe through my nose while running? At easy paces, many runners can breathe comfortably through the nose. At harder efforts, adding mouth breathing is normal and needed.

Can anaemia affect running? Yes. Low haemoglobin may reduce how much oxygen reaches your muscles, making runs feel harder. If you feel unusually tired or breathless, ask your doctor about a blood test.

References

• Lundberg JO, Farkas-Szallasi T, Weitzberg E, et al. High nitric oxide production in human paranasal sinuses. Nature Medicine. 1995;1(4):370-373.
• Lundberg JO, Settergren G, Gelinder S, et al. Inhalation of nasally derived nitric oxide modulates pulmonary function in humans. Acta Physiologica Scandinavica. 1996;158(4):343-347.
• Keck T, Leiacker R, Heinrich A, Kühnemann S, Rettinger G. Humidity and temperature profile in the nasal cavity. Rhinology. 2000;38(4):167-171.

About the author

Dr. Prashanth R Reddy is an ENT surgeon at ENTHealth360, Bangalore (MS ENT; MBA, IIM Bangalore; Seoul Rhinoplasty Fellowship), seeing patients at Sakra World Hospital, Marathahalli and in Koramangala. His practice focuses on how breathing affects sleep, energy and everyday performance.

Related reading: Why breathing matters for sleep and energy

For educational purposes only. Not a substitute for medical advice. Please consult a qualified ENT specialist.