Zac Cupples Profile picture
I help you move and perform better, and learn complex biomechanics in ridiculously simple ways
Dec 27, 2023 9 tweets 3 min read
Movement is incredibly complex, but there's one big overlooked reason for this. Image Even 2 people with similar mobility restrictions can move differently. But why? Image
Nov 16, 2023 9 tweets 3 min read
Think your inability to squat deep is because of limited ankles or deep hip sockets?

Think again!

While structure can influence your squat, there are also factors within your control.

This 🧵 will show you how to improve your squat mobility. Image Hot take.

Squat is a ROTATIONAL exercise.

Let me explain. Image
Oct 10, 2023 8 tweets 3 min read
If you feel upper back tension or have tight shoulders, then you need to look at your upper back mobility.

Consider this 🧵 the guide. Image Many know the sides and front of the ribcage expand as we breathe. But did you also know the backside does too?

The upper 6 ribs (dorsal rostral) area moves backward and upward as you inhale. Image
Sep 18, 2023 7 tweets 3 min read
Foam rollers were all the rage, then fell out of favor.

But for me, they're making a comeback.

Just not in the way they're traditionally used.

This 🧵 contains 5 ways I've been using a foam roller to get MEGA gains with my patients and clients. Image 1️⃣ Foam roller decompression

This study () showed that sidelying increases front-to-back dimensions. Throw in a foam roller, we may be able to magnify that more.

I've found this useful for improving rotation. pubmed.ncbi.nlm.nih.gov/28210033/
Aug 25, 2023 8 tweets 3 min read
2 ankle surgeries. Any dorsiflexion and squatting hurt.

2 exercises, IMMEDIATE change in motion & pain (after trying exercise on his own & conventional rehab)

Here's what we did 👇 Image 🔬 Objective findings - Narrow ISA

Active Straight Leg Raise - 60º per side
Hip ER L 45º R 35º
Hip IR L 40º R 45º

Shoulder flexion L 120º R 125º
ER L 55º R 60º
IR L 40º R 25º

Dorsiflexion L 10 R 5
Plantarflexion L 45 R 35
Aug 10, 2023 10 tweets 4 min read
If your mobility routine has:

❌ Thoracic extension drills
❌ Standing tall with shoulders back

Let me stop you right there ✋

Because you are missing a MAJOR piece that influences neck, upper back, shoulder, scapula, and more.

Check out the 🧵 to learn what it is Image Because if you've been told that arching over a foam roller is the key to shoulder health...

YOU'VE BEEN DUPED! 😱

You’ve been missing out on LEGIT thoracic spine mobility gains
Jun 20, 2023 8 tweets 3 min read
Anterior pelvic tilt.

Good for cover photos in glamour magazines, but is it an undesirable posture otherwise?

Read this 🧵 to learn. Image Anterior pelvic tilt (APT) is NOT just to make your daily selfies pop.

Some degree of APT is normal & may help force production.

It’s only a problem if there is an associated motion loss.

But NOT everyone has this posture. Image
May 9, 2023 8 tweets 4 min read
To fix rounded shoulders, should we simply stand up straight & pull our shoulders back all...the...time?

NO!

That's because that does NOT address the biggest contributor to rounded shoulders.

Read this 🧵 to learn what that is. Image Rarely do we ask:

"Why are rounded shoulders useful?"

This posture keeps the upper airway open because it pushes the head forward, just like when you give someone CPR.

But there are tradeoffs when this posture is all you have. Image
May 2, 2023 11 tweets 4 min read
Improving your ankle mobility can help a TON of movements–squatting deeper, cutting better, walking–but is the answer to ONLY work a bunch of dorsiflexion drills and calf stretches?

NO

This 🧵 explains the major 🔑 to improving your ankle mobility. Image The ankle dorsiflexes a fair amount depending on context. Up to 16.5º in nonweightbearing and in some cases 34.7º weight bearing!

It's an important motion to have, but there are other things that must happen at the foot-ankle complex to express the full range. Image
May 1, 2023 7 tweets 3 min read
Would you have this person deadlift from the floor?

NO!

This 🧵 will explain why and what you should do instead. Image If you have very little money, you ideally wouldn't try to buy things that are WAY out of your budget.

You'd want to save up the funds so you can buy what you want to buy.

What does this have to do with deadlifting? ImageImage
Apr 24, 2023 10 tweets 3 min read
Flat feet.

High arches

They aren't good or bad, just different movement strategies.

But what if that's the ONLY foot shape you have?

What if a high arch can't flatten? Or a flat foot can't arch?

This 🧵 will explain what you should do to improve your foot mobility. Image During gait, the foot NORMALLY arches and flattens.

Arch = supination

Flat = pronation

Gait has 3 phases:

1. Early stance - supination
2. Mid stance - pronation
3. Late stance - resupination Image
Apr 21, 2023 5 tweets 2 min read
If you want to improve your overall body mobility and loading capabilities, then learning how to attain the STACK is 🔑

But it's not a posture you force yourself into.

It's a movement strategy that maximizes movement in your body.

This 🧵 will show you the keys to getting it. Image 1. Head position

This dictates how the rest of the spine moves. Head up will arch. Head down will round.

The 🔑 here is to differentiate eye & head movement. Here's my framework:

1. Standing - horizon
2. Hinging - 5-7 ft
3. Prone - 1-2 ft (switched from slide) Image
Apr 20, 2023 4 tweets 2 min read
As we breathe, the ribcage changes shape based on air amount.

This influences scapular positioning.

This quick 🧵goes into the scapular mechanics during breathing Image First, we must know the resting position of the scapula:

1. 11º Anterior tip
2. 41º internal rotation
3. 5º upward rotation

ref - pubmed.ncbi.nlm.nih.gov/19181982/ Image
Apr 19, 2023 4 tweets 2 min read
Do you coach belly breathing?

If so...STOP

And that's because the ribs SHOULD move as we breathe.

This 🧵 explains how the ribs move during breathing. Image There are 2 rib movements during breathing:

1. Pump handle - Mostly the sternum and upper ribs
2. Bucket handle - Mostly lower ribs, though occurs at all.

During inhalation:

1. Pump handle - ribs move forward & upward
2. Bucket handle - ribs move outward & upward Image
Apr 16, 2023 5 tweets 2 min read
Many people have similar movement restrictions.

Is there 1 exercise that can hit these better than the rest.

I think so!

This 🧵 goes into what that is and why it works. Image To deal with forces, a common strategy we use is ⬇️ available rotation & pushing our center of mass forward. This ⬆️ stability, but comes at a cost:

Focal force absorption

Areas that contribute to this are the posterior lower pelvis & superficial abs. Image