Conor Harris Profile picture
Aug 28, 2020 9 tweets 3 min read Read on X
A thread on how to train the obliques

The six pack abs get all the love, but the obliques are way more responsible for movement & function.

The obliques have roles in:
✅Pelvic control
✅Trunk rotation
✅Trunk stiffness
✅Exhalation

They can be split into the internal... Image
and external obliques.

They have similar actions, but internal obliques have a larger role in breathing & the external with trunk rotation.

So given these roles, it’s important to consider the role of the muscle fiber orientation. They mainly run horizontally. This means we Image
want to train them in the frontal & transverse planes (sideways & rotationally) to recruit them for many of their functions.

I like to pair training pelvic control + exhalation because that’s what should be naturally occurring with the resting breath anyway.

To do this, I will Image
use a position that allows them to sense a posterior pelvic tilt, more obliques than six pack abs, and will be comfortable to breathe in.

This 90/90 side plank is WAY harder than you think if you add exhalation.

This is a go-to for beginners.
To train trunk rotation, I like a split stance to mirror gait/running a sense of the heel in the front, as that’s when we rotate our trunks to the same, stance-foot side. Image
Then I will cue very light rotations. It won’t take much to feel the trunk dissociation from the pelvis via the obliques.
Finally, to train the proper trunk stiffness aspect of them, sprinting is probably the #1 activity for that. I’m serious.

Other targeted work includes: Heavy deadlifts. But here’s the thing- instead of holding our breath in and bracing like all hell, exhale until
the obliques are felt. A reach helps with this. Then inhale on top of it and drive.

Way more obliques without needed to suck & hold air.

Nothing wrong with also targeting the six-pack abs. That’s fun too, but don’t forgot how important the other abdominal muscles are.
This is a Postural Restoration Institute exercise

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More from @Conor_Harris_

Sep 3
The Tibialis Posterior is one of the most underrated muscles for fixing knee, ankle, and foot pain.

Weakness here shows up in countless injuries - yet most rehab overlooks it. Let’s break down why it matters & how to train it 👇 Image
1️⃣ Why it’s so important
Research links a weak tibialis posterior to ankle & foot pain.

This muscle originates on the back of the shin and runs behind the medial ankle, under the foot. Its unique position makes it essential for arch control.
2️⃣ Controlling pronation
When your foot hits the ground, the arch naturally lowers (pronation).

The tibialis posterior decelerates this motion so it happens in a controlled, healthy way. Weakness = arch collapses too far, too fast.
Read 10 tweets
Sep 1
Struggling to squat deep without buttwink or your back rounding?

Most people blame it on ankle mobility… but that’s only part of the story.

Here’s what you need to know to fix your squat at the root cause 🧵 Image
The real question: why is ankle mobility limited in the first place? Image
One underrated reason 👉 Your body’s center of gravity is shifted forward.
Read 12 tweets
Aug 29
Most people are missing one key piece of hip mobility.

And if you don’t have it, your low back is the one paying the price.

Let’s talk about hip extension 🧵 Image
Hip extension = your ability to bring your leg fully under you and slightly behind you.

It’s one of the most commonly limited motions I see when assessing clients. Image
Why does it matter?

If you can’t extend at the hip, your body will find a workaround:

👉 Arching the low back instead.
This creates repetitive stress on the spine.
Read 9 tweets
Aug 25
Most people think Sciatica is caused by a tight piriformis muscle.

But the piriformis is usually just the messenger, not the root problem.

Here’s what’s really going on (and how to fix it)… 🧵 Image
Most people with sciatica think the issue is their piriformis muscle being too tight and pressing on the sciatic nerve.

So, they stretch it or roll it out for temporary relief…

But that tight piriformis is usually just a symptom of something bigger. Image
The real problem often starts with your body’s center of gravity shifting forward. This is what I commonly see in my clients with Sciatica.
Read 13 tweets
Aug 20
One of the most overlooked culprits in stubborn low back pain?

👉 The Quadratus Lumborum (QL).

It’s tight, overactive, and pulling your spine out of balance more often than you think.

Here’s why it matters and how to fix it 🧵 Image
First, it’s key to understand that the QL runs between your pelvic crest and lowest rib. Image
When it gets short and tight, it has 2 main effects:

•Both sides: compress + extend your low back (arching)
•One side: side-bend the spine, pull the shoulder down + hike the hip up
Read 11 tweets
Aug 18
Most people think anterior pelvic tilt, or hyperlordosis, is caused by:

•Tight hip flexors
•A tight low back
•Weak abs & glutes

But that’s just scratching the surface.

Understanding the real cause leads to better resulting fixing it 👇 Image
The overlooked question:

👉 Why are these muscles tight or weak in the first place? Image
With APT, the center of gravity of the pelvis + lower body shifts forward.

This pushes the pelvis down into hip flexion.

As a natural byproduct:
•Hip flexors get tight
•Low back gets tight
•Abs & glutes lengthen → weaken
Read 12 tweets

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