How to breathe and brace when lifting.

Why breathing technique matters under load

Most gym-goers never think about their breathing until a coach flags it mid-set. Fair enough — breathing is automatic. But under a loaded barbell, automatic breathing isn't the same as optimal breathing.

The spine flexes, compresses, and shears under load. What keeps it stable is intra-abdominal pressure (IAP) — pressure built inside your abdominal cavity by the diaphragm, deep abdominals, pelvic floor, and spinal erectors working together. Dr. Stuart McGill (University of Waterloo), one of the world's leading spine biomechanics researchers, has consistently shown that controlled IAP generation reduces compressive and shear forces on the lumbar spine during heavy lifting.

The Valsalva maneuver is the deliberate technique for maximising that pressure. Knowing when to use it — and when to skip it — is one of the highest-return technical skills you can develop.

The Valsalva maneuver: what it is and why it works

The Valsalva maneuver is forcibly attempting to exhale against a closed glottis (the opening between your vocal cords) while bracing the entire trunk. The result is a sharp rise in intra-abdominal and intra-thoracic pressure that converts your torso into a rigid cylinder.

It's not the same as passively holding your breath. A passive hold with a relaxed core produces far less IAP than a forceful brace against a closed airway. Both components — closed glottis and active bracing — are required.

• Reduced spinal compression. By hydraulically stiffening the abdominal cavity, the Valsalva transfers load away from the vertebral discs. McGill's research quantifies this reduction as meaningful, particularly in the lumbar spine during axial loading (squats, deadlifts).
• Improved force transfer. A rigid torso transmits leg drive to the bar more efficiently than a soft one. Energy 'lost' to spinal flexion is wasted output.
• Lower injury risk under heavy load. The consensus among strength researchers — including McGill, Dr. Greg Nuckols, and Dr. Eric Helms — is that braced lifting is safer than unbraced lifting for healthy individuals working with heavy loads. The Valsalva isn't a risk to avoid; it's a tool to deploy correctly.
• Brief duration only. The blood-pressure spike from a full Valsalva is real but transient — it resolves the moment you release the breath at the top of the rep. That's very different from holding across multiple consecutive reps.

The NSCA and ACSM both acknowledge the Valsalva as appropriate for trained individuals performing near-maximal lifts, with the recommendation to limit it to the sticking point of each rep rather than holding across multiple reps without breathing.

How to brace your core: the 360° cue

The most common mistake is bracing only the front of the abdomen — drawing in the navel or tensing the 'six-pack' muscles. That's not a brace; it's a vacuum. A real brace creates stiffness in all directions: front, sides, and back.

The cue that reliably produces this: breathe into your belly and push out 360°. Not up into your chest. Not only forward. Outward in every direction equally — as if you're pushing your waistband away from your body on all sides at once.

• Belly breath, not chest breath. Place your hands on your sides just above your hips. When you inhale to brace, those hands should move out laterally. If your shoulders rise instead, you're chest-breathing. Practice diaphragmatic breathing until the belly-out pattern is automatic.
• Big breath, then squeeze everything. Inhale to roughly 70–80% of lung capacity — a truly maximal breath makes the brace unwieldy. Then simultaneously contract your abs as if bracing for a punch, your lats as if trying to bend the bar over your back, and your glutes slightly. That whole-body tension is the brace.
• Push the floor away. On squats and deadlifts, cue pushing the floor away from you at the same moment you brace. This coordinates lower-body drive with trunk stiffness.
• Maintain through the sticking point. The most dangerous moment is when approaching the sticking point and a lifter reflexively breathes out to 'push' the weight. That's exactly backwards — the breath release drops IAP precisely when you need it most. Hold through the hardest part.
• Release at the top. Once you've passed the sticking point and locked out or returned to the start position, exhale, take a new breath, re-brace, then go again. On multiple-rep sets, reset between every rep.

McGill's practical cue — widely adopted by coaches — is to imagine someone is about to punch you in the stomach and brace as you would to absorb that punch. The resulting muscle activation is close to optimal. Pair this with the lateral-expansion breath and you've got the complete technique.

Step-by-step: squat, deadlift, overhead press

The sequence is the same across all heavy compound movements. Timing within the lift varies slightly.

• 1Set position first. Get under the bar (or grip it) and establish your whole-body position before breathing. Trying to brace while still finding your stance wastes the breath and distorts the brace.
• 2Inhale diaphragmatically. Fill to 70–80% capacity. You should feel expansion laterally and into your lower back — not just your chest rising.
• 3Close the glottis and brace 360°. The glottis closes with a sound like a soft 'k' at the back of the throat. Simultaneously contract abs, lats, and glutes. Your torso should feel like a pressurised cylinder.
• 4Initiate the movement. For the squat: descend with the brace intact. For the deadlift: engage the lats, take the slack out of the bar, then drive. For the overhead press: tuck the ribs, brace hard, then press.
• 5Maintain through the sticking point. This is non-negotiable. Don't exhale as the weight gets heavy.
• 6Exhale at the top or at the transition. Squat: exhale at lockout. Deadlift: exhale after the bar returns to the floor. OHP: exhale at the top or at the return to the rack position. Never exhale mid-rep under maximal load.
• 7Re-brace before the next rep. Even on a set of five, treat each rep as an independent brace. Take a fresh breath between every rep rather than breathing continuously while loaded.

For a full breakdown of squat and deadlift technique, see the dedicated pages for the squat and deadlift. Both include cue-by-cue form notes that pair with this breathing framework.

When to breathe normally (lighter loads and isolation)

The Valsalva isn't required — or optimal — for every set and every exercise. The guiding principle: the heavier and more axially loaded the movement, the more IAP matters. As load drops and the spine is less directly challenged, normal rhythmic breathing is fine.

• Isolation exercises (curls, lateral raises, leg extensions). These produce minimal spinal loading. Breathe naturally — exhale on the concentric (exertion) phase and inhale on the eccentric. There's no meaningful injury risk from not bracing hard on a bicep curl.
• Light and moderate sets (below ~60% of 1RM). At these intensities, IAP generation is less critical. Many coaches recommend a lighter brace — tense but not maximal — and allow continuous breathing for higher-rep endurance sets.
• Accessory core work. Exercises like dead bugs, Pallof presses, and the McGill Big Three target the core at sub-maximal loads. These use rhythmic bracing patterns specific to each exercise rather than a held Valsalva.
• Cardiovascular intervals. Running, rowing, and cycling require continuous gas exchange. Normal breathing is the only option; pacing exhales to effort level is the relevant skill.
• High-rep pump work (15+ reps). Holding one breath for 15 consecutive reps is neither safe nor practical. Breathe with each rep or every two reps, maintaining a partial brace throughout but not a full Valsalva.

A practical rule: if the exercise appears in your progressive overload plan as a main compound movement with load tracked over time, learn to Valsalva properly. If it's accessory or isolation work, breathe naturally and focus on the working muscle.

Safety notes and who should be cautious

The Valsalva produces a temporary and significant spike in both intra-abdominal pressure and blood pressure. For the majority of healthy, trained individuals this is well-tolerated and resolves immediately upon breath release. Specific populations, though, should exercise caution or avoid it entirely.

• Hypertension. Sustained or repeated breath-holding spikes blood pressure. If you have diagnosed hypertension, discuss lifting technique with your physician before applying full Valsalva. Partial bracing with brief controlled exhales on exertion may be more appropriate.
• Cardiovascular disease or history of stroke. The hemodynamic changes from Valsalva — increased intrathoracic pressure followed by a rebound increase in cardiac output on breath release — are contraindicated for several cardiac conditions. Medical clearance is required.
• Hernias (inguinal, abdominal, hiatal). Elevated IAP directly increases hernia risk and can exacerbate existing hernias. Proceed only with medical guidance.
• Pregnancy. Intra-abdominal pressure dynamics change significantly during pregnancy. Consult an obstetric physiotherapist or sports medicine physician for lifting guidance.
• Glaucoma. Valsalva increases intra-ocular pressure. Those with elevated intraocular pressure or glaucoma should seek ophthalmological advice before heavy lifting.
• Dizziness or visual blackout. If you experience lightheadedness or 'stars' after a heavy set, you're likely holding too long or not re-breathing between reps. Reduce the load, shorten the breath-hold, and re-breathe between every rep. Persistent symptoms warrant medical evaluation.

For healthy individuals without any of the above, the evidence is clear: braced lifting with controlled Valsalva is safer than unbraced lifting under heavy load. The risk of not bracing — uncontrolled spinal flexion under load — is greater than the transient pressure increase from a correctly performed breath-hold.

If you're structuring training around progressive overload principles, correct breathing and bracing belong in the same category as foot placement and bar path — foundational technique. Track your sets in SammaGym and include form notes in the session log to monitor technique alongside load progression.