Episode 75- How Vocal Tension Is Quietly Undermining Your Credibility (And How to Fix It)

Jane Anderson 2021 Keynote Speaker of the Year, Leadership body-language and voice Expert, Executive Coach, Author

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You know your material. You've rehearsed the pitch, prepared the board update, or practised the keynote a dozen times. And yet, something still isn't landing the way it should.

You come off stage with a tight neck. Your mouth goes dry halfway through a meeting. People nod politely, but you can feel that they're not quite as persuaded, or as trusting, as you'd expect them to be.

According to Dr Louise Mahler, Australia's 2021 Keynote Speaker of the Year and a leadership body-language and voice expert, that gap usually has nothing to do with your knowledge, your nerves, or your personality. It's physical.

Mahler's career path is an unusual one for a communication expert. She began with a degree in economics and statistics, spent a decade as a professional opera singer with a soloist's contract at the Vienna State Opera, and later completed a Master's in Organisational Psychology and a PhD in Business. That combination (technical rigour, trained vocal performance, and academic research) is the foundation for a specific and useful idea: your voice is not separate from your body, and the tension you carry physically is the single biggest thing shaping how credible, trustworthy, and confident you sound.

This article breaks down Mahler's framework, what she calls the mind-body-voice connection, the three physical habits most likely to be undermining your credibility right now, and why the usual advice ("just speak more slowly," "be more confident") rarely works.

What Is the Mind-Body-Voice Connection?

The mind-body-voice connection is Mahler's model for understanding communication problems. It states that vocal and communication issues, such as sounding tense, rushed, aggressive, or unconvincing, are almost always caused by physical tension in the body, not by a person's mindset or personality.

"The basis of my work is the mind body voice connection," Mahler explains. "Everything starts in the mind... but if you go back to the mind, it's too slow."

That last point matters. Most communication advice tries to fix the problem at the level of the mind: thinking more positively, feeling more confident, reframing your nerves. Mahler's approach skips that step entirely. Instead, she works with the body, because the body changes fast and the voice is simply the audible result of what the body is doing.

If someone is clenching their jaw, Mahler can hear it. If someone is breathing high in their chest, she can hear that too. And crucially, she argues, so can everyone else in the room, even if they can't consciously name what they're hearing.

This isn't just a coaching anecdote. Peer-reviewed research on paralinguistic cues and evaluative judgments has found that listeners form appraisals of a speaker's confidence and competence from vocal characteristics alone, independent of what's actually being said.

Why This Matters More Than Most People Realise

Most professionals assume that if their content is strong enough, their delivery is a secondary concern. Mahler's work suggests the opposite: physical tension shapes how your voice sounds, and how your voice sounds shapes whether people trust you, often before they've fully processed what you've said.

This is precisely why the physical habits below are worth identifying. They're not stylistic quirks. They're structural issues that quietly cost credibility in rooms where credibility is the entire point.

The Three Physical Habits That Undermine Your Credibility

Mahler points to three specific, observable habits that show up again and again in professionals, particularly those under pressure to perform, present, or lead.

1. Jaw Tension and Clenching

Jaw tension is one of the most common, and most damaging, habits Mahler identifies in her clients.

"If somebody has their jaw tension... you can hear clearly that they have a tension in the jaw," she says. On its own, that might just sound like a minor speech quirk. But the consequences run deeper. Left unaddressed, Mahler warns, jaw clenching can grind down teeth, make the tongue lazy, accelerate visible signs of ageing, and eventually pull tension into the neck, spine, and breath.

The immediate perception problem is just as significant: a clenched jaw reads as angry, tight, or aggressive, even when that's not the speaker's intention at all.

2. High, Shallow Breathing

The second habit is breathing "high": using the chest and shoulders rather than the diaphragm to draw breath.

Mahler describes the correct mechanics simply: "The stomach goes in, which squeezes the air out of the lungs." When people breathe high instead, they restrict airflow, tighten the throat, and change the sound and stability of their voice, often without realising why they suddenly feel less in control.

3. Speaking Too Fast for Your Own Breath

The third habit is pace: specifically, speaking faster than your breath support can sustain.

This one is personal for Mahler. "Because I have no ear, I speak really quickly," she admits. And the common advice, just slow down, doesn't actually solve the underlying issue. "I actually can't speak more slowly," she says. "It's all about getting your body lined up, getting the air down."

In other words, pace isn't a willpower problem. It's a breath-support problem. Fix the breathing, and the pace often corrects itself.

Why "Just Speak More Slowly" Doesn't Work

This is the point where most generic public-speaking advice falls short. Telling someone to "slow down," "relax," or "be more confident" addresses the symptom, not the mechanism.

Mahler's clients don't usually describe their problem in technical terms. They describe it emotionally: "I have lost my confidence." She's heard it so often, she jokes, that she'd be rich if she had a penny for every time.

But her diagnosis is rarely about confidence as a trait. It's about credibility and trust as a direct consequence of physical habits. "You will lose trust if you're holding your breath," she says. "People don't trust people who break the sound like that. And you can't have influence because you can't get through all of that trust and credibility to have influence."

This reframe matters because it changes where the fix needs to happen. If the problem is genuinely psychological, the solution is confidence-building exercises, mindset work, or exposure therapy. If the problem is physical (a locked jaw, high breathing, a pace outmatched by breath support), then confidence-building alone won't touch it. The body has to be addressed directly.

The trust link isn't just anecdotal, either. Research from the University of Pennsylvania's Wharton School on how vocal delivery persuades found that a speaker's vocal confidence can shift how persuasive their message is, even when the words themselves don't change. Separately, NIH-published research on vocal trust has shown that listeners form trust judgments from vocal delivery that can persist even after a speaker's actual trustworthiness becomes evident, underlining just how much is riding on the voice itself, not only the message.

The Professional Line: What Vocal Mastery Actually Looks Like

Mahler uses a simple visual model to describe what progress and mastery look like over time.

Picture a graph. The X-axis represents time: engagement after engagement, presentation after presentation. The Y-axis represents performance excellence. Early on, most people's performance bounces unpredictably: sometimes strong, sometimes weak, rarely consistent.

Somewhere on that graph sits what Mahler calls "the line of excellence": the point at which performance becomes reliably professional. Most people cross it occasionally. Mastery, in her definition, means staying above that line consistently, even on an off day.

"You have to be able to perform under water," she says. "It has to be under control." That control isn't built in the moment of performance. It's built beforehand, through technique that's practised enough to become automatic. As Mahler puts it, "you only ever use five percent of your mind for your technique" during an actual performance; the rest of the work has to already be done.

This is also why she's sceptical of over-preparation as a strategy on its own. Without a clear framework guiding the engagement, more rehearsal time doesn't reliably produce more consistency. What produces consistency is addressing the physical fundamentals (jaw, breath, pace) until they no longer need conscious attention at all. The same reliance on a repeatable framework, rather than raw effort, shows up in how other experts on the show structure their own high-stakes work. See how facilitator Jacinta Cubis distinguishes facilitation from training.

From Confidence Loss to Confidence Rebuilt

It's worth being precise about what Mahler is, and isn't, claiming. She's not arguing that mindset, preparation, or experience don't matter. She's arguing that when professionals experience a specific, recurring pattern (technically competent, but somehow not landing, not trusted, not "confident" in delivery), the first place to look is the body, not the mind.

This reframing tends to be a relief for the people she works with. A confidence problem can feel like a personal, difficult-to-fix flaw. A jaw-tension problem, a breathing-pattern problem, or a pace problem is concrete, observable, and, critically, trainable. It's a similar shift to the one Sue Anderson describes when reframing feedback as a fixable skill rather than a personal failing: naming the concrete mechanism removes the sting and makes the fix actionable.

That's the throughline of Mahler's entire practice: analysis first (what's actually happening physically), then a body-language and health lens (what this tension is costing the person, not just how it looks to others), and finally skills and transformation (retraining the specific habit).

How Louise Built a Practice Without Traditional Marketing

There's a second, quieter lesson running through Mahler's story, one that's directly relevant to consultants, coaches, and experts building their own practice.

Mahler has built a globally recognised practice, coaching CEOs, federal politicians, and international business leaders, almost entirely without traditional marketing. "All of my work comes from people who know me," she says. "It's very hard to sell work... people don't get the work until they see it."

Her advice to other experts is characteristically direct: "Get up and do, do, do, do, do. I don't have any smart marketing strategies. I just work." In practice, that means staying in contact with her professional network, following up, and consistently delivering work strong enough that clients return and refer her.

This matters because Mahler operates in a genuinely under-served niche. As she explains, there are roughly 32 recognised fields of voice work, but almost none of them address voice specifically for business professionals. Speech pathologists look for medical issues. Singing teachers look for singers. Actors look for performers. "There's few people who can help you in the every day," she says, which is precisely the gap her work fills.

She's also used public visibility strategically, most notably a viral body-language analysis of Amber Heard that reached 2.7 million views, not as an end in itself, but as a way to demonstrate expertise to people who might later want the deeper, transformational coaching work. As she puts it, media appearances are "the lowest common denominator": entertaining, simplified, and useful for visibility, but not a substitute for the real coaching relationship.

That balance between visible presence and depth of practice is a recurring theme among the consultants featured on the show. See how Maya Nova approaches mindful leadership under pressure for another angle on staying composed and credible in high-visibility moments. For more conversations with leading consultants and coaches, browse the full Jane Anderson Show podcast library.

Frequently Asked Questions

Why does my voice sound tense when I'm speaking or presenting? 

Vocal tension usually starts in the body, not the voice itself. Common physical causes include jaw clenching, breathing high in the chest instead of the diaphragm, and speaking faster than your breath can support. These habits change how your voice sounds, often without you noticing them directly.

Is a tense or strained voice caused by nerves, or something physical? 

It can be either, but Dr Louise Mahler's work focuses specifically on physical causes (tension held in the jaw, throat, neck, and breathing pattern) that persist regardless of how nervous or prepared a person feels. Addressing the physical habit directly is often faster than trying to manage nerves alone.

How does vocal tension affect how trustworthy I sound? 

According to Mahler, listeners register vocal tension, even unconsciously, as a lack of ease or control, which reduces perceived trustworthiness. "You will lose trust if you're holding your breath," she says. Since influence depends on trust, unresolved vocal tension can directly limit how persuasive someone is, regardless of their content.

Can vocal tension be fixed quickly, or does it take months of training? 

Because the issues are physical and specific (a locked jaw, a breathing pattern, a pace mismatch), they can often be identified and improved relatively quickly once someone knows what to look for. Long-term consistency (staying "above the professional line") takes ongoing practice, but the initial diagnosis and correction can happen fast.

What's the difference between confidence and credibility when speaking? 

Confidence is an internal feeling; credibility is how trustworthy and capable you sound to others. Mahler's clients often describe their problem as "losing confidence," but the underlying issue is usually a credibility problem caused by physical habits, meaning the fix is technical, not purely psychological.

Who is Dr Louise Mahler? 

Dr Louise Mahler is Australia's 2021 Keynote Speaker of the Year, a leadership body-language and voice expert, and executive coach. She holds a PhD in Business and a Master's in Organisational Psychology, previously worked as a professional opera singer with a soloist contract at the Vienna State Opera, and is the author of "Resonate," published by Penguin Random House.

Conclusion

The instinct to treat vocal and communication struggles as a confidence issue is understandable: that's how they feel from the inside. But Dr Louise Mahler's work offers a more useful, more actionable reframe: most of what undermines credibility when you speak is physical, specific, and correctable. A locked jaw, a high breathing pattern, a pace that's outrunning your breath: these aren't personality traits. They're habits, and habits can be retrained.

For consultants, coaches, and leaders whose influence depends on being heard, trusted, and believed, that's genuinely good news. The fix isn't a personality overhaul. It's technique.

Work With Jane Anderson

Want to build the kind of visible, credible practice Louise describes? Explore Women with Influence, Jane Anderson's community for consultants and thought leaders building world-class practices by design, or listen to the full conversation with Dr Louise Mahler on Apple Podcasts.

 

Key Takeaways from Today’s Episode:

 

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Most of the guests interviewed are current or alumni members of the Women With Influence community. Click here to find out more

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Episode 74- Personal Branding vs Company Branding: What 20 Years of Board Advisory Work Taught Dr Monique Beedles