Your Body Is Not Parts. It's Lines.

Everything you were taught about your body is based on a dead person.

That’s not hyperbole. The anatomical model most of us carry around in our heads, the one with neatly labeled muscles attached to bones like rubber bands on sticks, comes from cadaver dissection. Someone took a scalpel, cut away connective tissue, isolated a muscle, gave it a name, and moved on to the next one.

The problem? That’s not how your body actually works.

When you’re alive and moving, nothing in your body operates in isolation. Your muscles don’t start and stop at the attachment points in a textbook. They’re wrapped in, connected by, and communicating through a continuous web of fascia that runs head to toe, fingertip to fingertip, surface to core.

And that changes everything about how we should think about pain.

The old model is a parts catalog

Think about the last time you went to a doctor or physical therapist with a complaint. Shoulder hurts? Let’s look at the shoulder. Knee pain? Must be a knee problem. Low back acting up? Here are some exercises for your low back.

This is the parts catalog approach. It treats your body like a car. Find the broken part, fix the broken part, send the patient home.

It works sometimes. If you have a torn ACL, you need that ACL addressed. I’m not dismissing orthopedic medicine. But for the vast majority of chronic pain, postural issues, and movement limitations that people bring to me in my structural integration practice, the parts catalog approach falls short. It falls short because the problem is rarely where the pain is.

Someone comes in with chronic neck pain. They’ve been getting neck massages for months. Relief lasts a couple of days, then the pain returns.

Through the lens of fascial lines, the picture looks different. The tension is running from the plantar fascia up the back of the legs, through the lumbar fascia, pulling the whole posterior chain into a pattern that forces the neck to compensate. Think of it like a snagged thread in a wetsuit. The pull is at the ankle, but the restriction shows up at the collar. The neck isn’t the problem. The neck is the victim.

Enter the lines

Starting in the 1990s, bodyworker and teacher Tom Myers began mapping something that practitioners like me had been feeling under our hands for years. He traced continuous pathways of fascia and muscle through the body. Not isolated muscles. Not individual structures. Connected lines that transmit force, carry tension, and organize movement from one end of the body to the other.

He called this framework Anatomy Trains.

The basic idea is this: fascia doesn’t just wrap individual muscles. It connects them into functional chains. These chains, which Myers calls myofascial meridians, run in specific, mappable pathways through the body. Once you understand the lines, the way you see the human body changes permanently.

Here are the main lines I’ll be covering in this series:

• The Superficial Back Line runs from the bottom of your feet, up the back of your legs, over your spine, across your scalp, and down to your brow ridge.
• The Superficial Front Line runs from the tops of your toes, up your shins and quads, through your abdomen and chest, to the side of your neck.
• The Lateral Line runs from the outside of your foot, up the side of your leg and torso, to behind your ear.
• The Spiral Line wraps around your body in a double helix, creating and controlling rotation.
• The Arm Lines (four of them) connect your fingertips to your spine and ribcage.
• The Deep Front Line runs through your body’s core, from your inner arch through your deep hip muscles, diaphragm, and up to the base of your skull.
• The Functional Lines cross your body diagonally, connecting opposite arms and legs.

Each of these lines has its own personality, its own common restrictions, and its own set of problems when things go wrong. I’ll be writing about each one in detail in the coming weeks.

Why lines matter more than parts

Let me give you a concrete example.

Here’s a pattern I see all the time: someone who’s been stretching their hamstrings for two years. Foam rolling. Yoga. Nothing changes.

When I assess these bodies, the hamstrings usually aren’t actually short. They’re being pulled taut. The restriction is in the plantar fascia and deep calf tissue. That tension yanks on the hamstrings from below, like a bungee cord anchored at the ankle. The hamstrings are the symptom. The feet are the source.

Work on the lower legs and feet, and the hamstring “tightness” resolves. No hamstring stretching required.

This is what happens when you shift from a parts model to a lines model. You start asking different questions. Not “what muscle hurts?” but “what line is restricted, and where along that line is the primary restriction?”

The implications are massive:

For pain. Your chronic pain might originate far from where you feel it. That nagging low back pain could be driven by restrictions in your feet, your hip flexors, or your rib cage.

For posture. Your forward head posture isn’t just a neck problem. It’s the end result of tensions and restrictions distributed across multiple lines.

For movement. Your inability to fully extend your hip during running might be caused by restrictions in your front line, not weakness in your glutes.

For treatment. Addressing only the site of pain is like turning off a fire alarm without putting out the fire. The alarm will just go off again.

What fascia actually is

If you haven’t read it yet, I wrote a detailed post on what fascia is and why it matters. But here’s the short version.

Fascia is connective tissue. It’s everywhere in your body. It wraps every muscle, every organ, every nerve, every bone. It forms continuous sheets and bags and tubes that organize your body’s structure from the cellular level to the whole-body level.

For a long time, anatomists treated fascia as packing material. The stuff you cut away to get to the “important” structures. That was a mistake. Fascia is load-bearing. It’s sensory-rich (more nerve endings than muscle in many areas). It remodels in response to how you use your body. And critically, it connects structures that traditional anatomy treats as separate.

When Tom Myers traced the Anatomy Trains lines, he was following these fascial connections. He wasn’t inventing them. He was documenting what was already there, hiding in plain sight, dismissed for centuries as unimportant packing material.

How I use this in practice

I’m a structural integration practitioner here in Santa Cruz, California. The work I do is organized around a progressive 12-session series that systematically addresses the body’s fascial lines. The Anatomy Trains framework is the map I use to navigate each client’s body.

In the early sessions, we work with the superficial lines. The back line, the front line, the lateral line, the spiral line. These are the outermost layers of fascial organization, and they need to be released and balanced before we can effectively access deeper structures.

In sessions five through eight, we go deeper. The deep front line. The arm lines where they connect to the torso. This is where the really transformative work happens, because the deep front line is the body’s core structural support.

In the final sessions, we integrate. We make sure all the lines are talking to each other properly. We work on movement patterns, not just tissue quality. This is where the body learns to use its new freedom.

I’ll map this out in much more detail in Post 9 of this series, but I wanted to give you the overview here.

This is not just theory

I want to be clear about something. The Anatomy Trains model is not a belief system. It’s an anatomical framework supported by decades of dissection work, clinical observation, and increasingly by imaging research. The fascial connections Myers mapped are physically present in human bodies. You can see them. You can feel them under your hands.

That said, no model is perfect. The body is more complex than any map can capture. The lines are not railroad tracks with rigid boundaries. They blend, they communicate, they overlap. The model is a useful simplification, a way to think about whole-body patterns that the traditional parts-catalog approach misses entirely.

I use it because it works. It helps me find the source of problems that have stumped other practitioners. It gives me a logical framework for deciding where to work and in what order. And it helps my clients understand why I’m working on their feet when they came in for neck pain.

What this series will cover

Over the next 13 posts, I’m going to walk you through each of the major Anatomy Trains lines. For each one, I’ll cover:

• What the line is and where it runs
• What it feels like when it’s restricted
• What common problems trace back to that line
• How I address it in my structural integration sessions
• What you can start noticing in your own body

I’ll also cover some practical topics. Why stretching doesn’t work the way most people think. Why your plantar fasciitis might actually be a hip problem. Why your jaw tension might live in your pelvis. And how the 12-session series is designed to address these lines in a specific, progressive order.

My goal is not to turn you into an anatomist. It’s to give you a different way of thinking about your body. One that might finally explain why that thing you’ve been dealing with hasn’t responded to the usual approaches.

A different way of seeing

Once you understand your body as lines rather than parts, you can’t unsee it. You’ll watch someone walk down the street and notice how their spiral line is pulling their right shoulder forward. You’ll feel your own superficial back line when you bend forward. You’ll understand why that person’s knee pain is related to their ankle, not their knee.

It’s a more complete, more accurate, and frankly more interesting way to understand the body you live in.

And if you’ve been dealing with something that won’t resolve, whether it’s chronic pain, restricted movement, or a posture that feels stuck, understanding these lines might be the first step toward figuring out what’s actually going on.

If you’d like to experience this approach in person, I work with clients here in Santa Cruz through my 12-session structural integration series. You can book a session anytime. And if you want to keep learning, the next post in this series covers the Superficial Front Line, the line running from your toes up through your quads, abs, and chest that gets chronically shortened by sitting all day.