Trauma Release Exercises (TRE): Why We Shake After Stress, Trauma and Intense Emotion

Could shaking be one of the body's oldest and most overlooked methods of regulating the nervous system?

Watch almost any mammal survive a life-threatening event and you'll notice something remarkable.

A gazelle escapes a lion, reaches safety... and begins to shake.

A dog experiences a frightening encounter... then trembles from head to tail.

Humans do it too.

After a near miss in the car.

Following a traumatic event.

During childbirth.

After crying intensely.

Even after an exhausting workout.

Most people assume shaking is simply a sign that something is wrong.

But what if it's actually a sign that something is going right?

What if those involuntary tremors are part of an ancient biological process designed to help the nervous system transition from survival back to safety?

This idea forms the basis of Trauma Release Exercises (TRE®)—a series of exercises designed to intentionally produce involuntary shaking, known as neurogenic tremors.

Although research into TRE is still emerging, modern neuroscience provides several fascinating clues about why shaking may play an important role in nervous system regulation.

Let's explore what we currently know.

What Are Trauma Release Exercises (TRE)?

Trauma Release Exercises (TRE®) are a sequence of movements designed to gently fatigue muscles around the legs and pelvis until involuntary shaking begins.

These tremors are not consciously created.

Instead, they arise automatically from motor circuits within the spinal cord and brainstem.

The aim isn't simply to make the body shake.

The goal is to encourage the nervous system to reduce unnecessary protective muscle tension and transition away from a chronic state of stress.

While some people describe TRE as "releasing trauma," the science suggests something slightly different—and arguably far more interesting.

The Body Doesn't Respond to Danger. It Responds to Perceived Danger.

Your brain is constantly asking one question:

"Am I safe?"

Every second your nervous system collects information from your eyes, ears, muscles, joints, internal organs, breathing and previous experiences.

If your brain concludes that you're under threat—whether from a predator, chronic pain, financial pressure or emotional stress—it activates one of the most powerful survival systems evolution has ever created.

This is known as the fight or flight response.

Within fractions of a second the amygdala, hypothalamus and brainstem activate the sympathetic branch of the autonomic nervous system.

Adrenaline and noradrenaline flood the body.

Heart rate rises.

Breathing becomes faster.

Blood pressure increases.

Glucose is released into the bloodstream for immediate energy.

Blood flow is redirected towards the muscles needed to run, climb or fight.

Even before you consciously move, your muscles become more active.

This increase in muscle tone isn't a mistake.

It's protection.

Your nervous system is preparing you to survive.

Why Physical Movement Was Designed to Complete the Stress Response

For almost all of human evolution, stress and movement occurred together.

If danger appeared...

You ran.

You climbed.

You fought.

You escaped.

The physical exertion wasn't simply a consequence of the stress response.

It was part of its resolution.

As muscles repeatedly contracted and relaxed, enormous amounts of sensory information travelled back to the brain.

Breathing gradually slowed.

Heart rate recovered.

Stress hormones declined.

The nervous system received consistent evidence that the danger had passed.

Protection was no longer necessary.

The body returned to a state of recovery.

Why Modern Life Confuses the Nervous System

Today, the threats have changed.

Emails.

Deadlines.

Financial pressure.

Relationship conflict.

Poor sleep.

Persistent pain.

Social media.

Our brain often responds to these psychological stressors using the same biological machinery that once helped us escape predators.

The difference is that we rarely complete the movement our body prepared us for.

We don't sprint after reading an email.

We don't physically resolve workplace stress.

Instead, we sit.

Hours become days.

Days become months.

The immediate stress passes, but the nervous system may continue behaving as though protection is still required.

Chronic Stress Doesn't Store Energy—It Stores Protective Patterns

A common belief is that stress becomes "trapped" inside the muscles.

Current neuroscience suggests something different.

The glucose released during stress isn't stored inside muscles waiting to be shaken out.

Instead, what often persists is the pattern of neural activation.

The brain continues sending increased motor signals to skeletal muscles.

Breathing becomes shallower.

The diaphragm contributes less effectively.

Movement becomes more rigid.

Protective muscle guarding increases.

Over time, these movement strategies become increasingly automatic through neuroplasticity.

The nervous system becomes exceptionally efficient at protecting you.

Ironically, the longer this continues, the more that protection itself can contribute to persistent pain, stiffness and fatigue.

What Happens When We Can No Longer Fight or Run?

Sometimes the nervous system concludes that neither fighting nor escaping is possible.

Another defensive strategy may emerge.

Immobilisation.

Within Polyvagal Theory this is often described as dorsal vagal activation, although the underlying neurophysiology remains an active area of scientific debate.

People often describe feeling:

• exhausted

• emotionally numb

• disconnected

• heavy

• unmotivated

Rather than preparing for action, the nervous system shifts towards conserving energy.

Like fight or flight, this is not weakness.

It is another survival strategy.

Why Do Humans Shake After Trauma or Stress?

This is where neurogenic tremors become particularly interesting.

Shaking appears to be generated automatically by neural circuits within the spinal cord and brainstem.

Rather than representing a loss of control, tremoring may represent the nervous system transitioning out of a protective state.

Each tremor rapidly alternates muscles between contraction and relaxation.

Thousands of times.

This repeated cycling may help reduce unnecessary muscle guarding.

It floods the brain with fresh proprioceptive information from muscles, joints and connective tissue.

It increases movement variability—something healthy nervous systems rely on.

Many people also begin sighing, yawning and breathing more deeply, behaviours associated with increased parasympathetic activity.

Perhaps most importantly, tremoring provides the brain with new evidence that movement can occur safely.

From a predictive processing perspective, the brain begins updating one of its most important beliefs:

"I no longer need to protect this body to the same degree."

Do Trauma Release Exercises Really Release Trauma?

This is where it's important to separate science from marketing.

There is currently no strong scientific evidence that trauma is literally stored inside muscles or fascia waiting to be released.

However, there is growing evidence that chronic stress changes:

• autonomic nervous system regulation

• motor control

• muscle tone

• breathing patterns

• pain processing

• movement behaviour

Viewed through this lens, Trauma Release Exercises are probably not releasing trauma itself.