The basic rule is simple: breathe in during the lowering phase of a lift and breathe out during the lifting phase. Inhale through your nose as the muscle lengthens, then exhale through your mouth as the muscle contracts and you push or pull the weight. This pattern applies to nearly every exercise, though heavier loads call for a different technique entirely.
The Basic Breathing Pattern
Every rep has two phases. The eccentric phase is when the muscle lengthens under load (lowering a squat, bringing a barbell down to your chest). The concentric phase is when the muscle shortens to move the weight (standing up from a squat, pressing the bar off your chest). You inhale just before the eccentric phase begins and exhale steadily through the concentric phase.
In a squat, that means taking a breath in right before you lower your hips, then exhaling as you drive back up to standing. In a pushup, you inhale as you bend your elbows toward the floor and exhale as you press yourself back up. For a biceps curl, inhale as you lower the dumbbell and exhale as you curl it toward your shoulder. The pattern stays consistent across exercises: air in on the easy part, air out on the hard part.
Breathing this way serves two purposes. It keeps oxygen flowing to working muscles, and the exhale during exertion helps you generate slightly more force. The American Council on Exercise notes that when this rhythm is practiced at a steady pace, it can improve force output during resistance training.
How to Brace Your Core
Breathing during lifting isn’t just about oxygen. It’s about creating pressure inside your torso that supports your spine. This is called bracing, and it starts with how you take the breath in the first place.
Instead of breathing into your chest, breathe into your belly using your diaphragm. Place your hands on your lower ribs and take a deep breath through your nose. You should feel your rib cage expand outward in all directions, not just your chest rising. Once that air is in, tighten your abdominal muscles as if someone were about to poke you in the stomach. This combination of a deep diaphragmatic breath and tensed abs turns your torso into something closer to a rigid cylinder. When trunk muscles contract around a full breath, the abdominal and thoracic cavities form a pressurized column that transfers load away from the spine and adds stability.
You don’t need to overthink this on light sets. But on any lift where your back is under significant load (squats, deadlifts, overhead presses, rows), bracing before each rep makes a real difference in how stable you feel.
The Valsalva Maneuver for Heavy Lifts
For near-maximal efforts, most experienced lifters use a technique called the Valsalva maneuver. You take a full diaphragmatic breath, then attempt to forcefully exhale while keeping your mouth and nose closed. This dramatically increases the pressure inside your abdomen, creating a more rigid and supportive trunk.
Research confirms that the Valsalva maneuver significantly increases intra-abdominal pressure compared to normal breathing. It has also been shown to reduce the amount of time spent in the hardest portion of a lift, the “sticking point,” during one-rep max bench press attempts. For a single heavy squat or deadlift, this technique helps your spine stay neutral under loads that would otherwise feel unstable.
The maneuver is straightforward in practice. Before you begin the rep, take a big belly breath, seal your airway, brace hard, complete the rep, then exhale at the top. On a heavy set of three to five reps, you can either hold your breath for the entire rep and reset your breath at the top, or take a fresh breath between each rep. Most lifters find that resetting between reps works best for sets longer than two or three reps.
Why Heavy Breath-Holding Spikes Blood Pressure
The Valsalva maneuver comes with a significant tradeoff. A study published in the Archives of Physical Medicine and Rehabilitation measured blood pressure during heavy lifting and found that the average reading at 100% of a lifter’s max with the Valsalva was 311/284 mmHg. The highest individual recording hit 370/360. For context, normal resting blood pressure is around 120/80.
When the same lifters performed the same weight while slowly exhaling instead of holding their breath, average blood pressure dropped to 198/175, a statistically significant reduction. Even at 85% of max, slow exhalation produced a noticeably lower pressure response. These spikes are brief and typically well-tolerated in healthy people, but they represent a real concern for anyone with high blood pressure, a history of heart problems, or risk factors for stroke or aneurysm.
If you fall into any of those categories, using the standard inhale-exhale pattern (breathing out steadily during the exertion phase) is considerably safer than holding your breath. You’ll sacrifice some trunk stability, which means you may need to work with slightly lighter loads, but the reduction in cardiovascular stress is substantial.
Matching Your Breathing to Rep Ranges
Your breathing strategy should change based on how heavy the weight is relative to your max.
- Heavy singles, doubles, and triples (85-100% of max): The Valsalva maneuver makes the most sense here. Take a full breath, hold it through the rep, exhale and reset at the top. Spinal stability matters most when loads are highest.
- Moderate sets of 5 to 8 reps (70-85% of max): You can use a lighter version of the Valsalva, holding your breath through the hardest portion of each rep and exhaling near the top. Some lifters prefer to simply exhale forcefully during the concentric phase without fully sealing their airway. Either works.
- Higher-rep sets of 10 or more (below 70% of max): Rhythmic breathing becomes more important than maximum bracing. Inhale on the way down, exhale on the way up, and keep the tempo consistent. Holding your breath for every rep of a set of 15 will leave you lightheaded before the set is over. Steady airflow keeps oxygen delivery to your muscles and helps you sustain effort across the full set.
Common Breathing Mistakes
The most frequent error is simply forgetting to breathe at all. Many beginners hold their breath reflexively through an entire set of 10 or 12 reps, not as a deliberate bracing strategy but because they’re concentrating so hard on the movement. This leads to dizziness, headaches, and occasionally fainting. If you notice your vision narrowing or your face turning red on moderate-weight sets, you’re probably holding your breath without realizing it.
Another common mistake is breathing backward, inhaling during the exertion and exhaling during the lowering phase. This tends to collapse your trunk at exactly the moment you need the most support. It also makes the concentric phase feel harder than it should.
Shallow chest breathing is the third issue worth correcting. If your shoulders rise toward your ears when you breathe in, the air is going into your upper chest rather than expanding your torso. This creates very little intra-abdominal pressure and offers almost no spinal support. Practice diaphragmatic breathing between sets: hands on your lower ribs, breathe in through your nose until you feel your sides expand, then tighten your abs. Once this pattern feels natural at rest, it becomes much easier to use under load.