The Glute and Core Guide

The Glute and Core Guide


We learned it from Chubbs… “It’s all in the hips.”

When looking across all athletic performance this rings true. That’s because the hips are the powerhouse for the human body. The hip is a combination of big movers and smaller stabilizers that work together to generate both power and balanced movement.

And who could forget about “The Core”? It’s actually made of more muscles than just 6-pack abs and its function extends far beyond looking good naked. It maintains the spinal curvature to prevent injury and is essential for athletic performance by transferring power through the torso to the extremities.

Unfortunately, we tend to sit too much, and training is often too one dimensional, which leads to impairments of the hip and core. This not only limits performance but often leads to back and knee pain.

The glute and core guide will cover common weak links that contribute to pain and injury…and what could be holding your performance back.

The Glute and Core Guide

These are the key players that either make or break a high performer:

Gluteus Maximus

This is the largest and strongest of the glute muscles (and makes an important statement for your physique!)

It extends the hip forcefully for sprinting, jumping, and lifting, and externally rotates the hip— can I get a “knees out!”.  

It also stabilizes the pelvis and can extend trunk from a forward lean position (which is important for your squat and deadlift.

The Breakdown

A weak glute max leads to poor hip extension.  The lumbar erectors then have to pick up the slack, which often leads to low back pain.  

Tightness or weakness of the glute max can lead to lateral knee pain because part of its tendon forms the IT band.  The glute max also works with deep core stabilizers to stabilize the important junction of the pelvis and spine (ref).

Gluteus Medius / Gluteus Minimus

These two muscles lie deep in the gluteus maximus and primarily lift the leg away from the body.  It also has a secondary role in internal rotation of the hip.

The Breakdown

A weakness of these smaller glute muscles results in a pelvic drop to one side during a single leg stance that's commonly seen during walking and running—this is known as Trendelenburg sign. 

A weakness of the gluteus medius and minimus results in the knee collapsing inward (called knee valgus) due to the inability to stabilize the leg under the center of mass.  This has been associated with increased lower extremity injuries – specifically patellofemoral pain (pain in front of the knee), ACL tears and IT band syndrome. (ref)


The most powerful of the deep rotators.  When the hip is extended it works in conjunction with the other external rotators of the hip (especially glute max).  When the hip is flexed, the piriformis switches to an internal rotator and performs abduction. It also co-contracts with the glute med/min to create stability at the hip joint.   

The Breakdown

A weakness of the piriformis results in internal rotation of the femur which creates a dangerous position for the knee.  It’s can also lead to poor pelvic control during walking/running.

The sciatic nerve passes directly under the piriformis (in 15-20% of people it actually splits the piriformis).  The tightness of the piriformis can result in piriformis syndrome, which generates numbness and tingling down the leg.

Tensor Fascia Latae 

Better known as the TFL and located at the anterior lateral aspect of the hip (basically under your front pocket.) It’s primarily involved in hip abduction (lifting to the side) and becomes more active with hip flexion (knee to the chest). It also works as an internal rotator and hip flexor. Its tendon joins the gluteus maximus tendon to create the IT band. 

The Breakdown

Often tight from prolonged sitting – tightness can increase the risk of IT band syndrome as well as cause a pinching in the front of the hip during squatting. Overuse of TFL rather than the glutes (specifically glute max) creates femoral IR and increases the risk of knee injury.

The Core

This is the ultimate buzz word in the fitness world, primarily used as a code word for 6-pack abs. But more importantly, it’s a large combination of muscles, both big and small, that move and stabilizes the spine.  


We won’t get into the specifics of each muscle here, but it’s important to understand the core’s role in torso stability. Consider the stability of an unopened soda can, it is really hard to crush. But if you compromise the can by opening it or denting one of the sides, then it is much easier to crush. The core is similar, four sides and a top and bottom that work together to create stability with mobility. 

The Breakdown

Low back pain is extremely common, with more than 80% of people experiencing at least one episode of LBP in their lives (most of these being recurrent.) The most common pain generators are muscle spasms, facet joint dysfunction, and disc pathology.

Low back pain is a multifaceted issue, with research showing the gluteus muscles are weaker in those with LBP, and a glute strengthening program in addition to improving core stability, had a greater decrease in lower back pain when compared to only improving the core (ref).

Seek and Destroy your Dysfunction

You’ve learned a bit about what’s going on beneath the surface, but it’s more important to understand how these issues reveal themselves.

Dynamic Valgus

This is an especially dangerous position for the knee, commonly recognized as the knee caving inwards. Dynamic valgus results in many types of knee pain, meniscus tears, and increase the risk of ACL tears.

Knee valgus is commonly misunderstood as an issue with the knee joint, but it’s actually caused by impairments of the hip. As discussed above, maintaining proper alignment of the knee starts by stabilizing the pelvis and the strength to support the femur under the bodyweight. This becomes even more pronounced during a single leg stance, especially when under fatigue. 

Quad Dominance

The quads (the muscles on the front of the leg) often dominate over the hamstrings and glutes. This combination of quad strength vs. a weak posterior chain is a common issue in those experiencing back and knee pain. 

Poor Hip Extension

The largest and strongest of the glute muscles produce hip extension. It’s important for running, jumping, and makes an important statement for your physique! If you can’t create the necessary power from your hips, the body does its best to find it elsewhere, which are often compensations of the low back.

Weak Core

A strong core is clearly needed to stabilize the spine for big lifts, but that is only one piece of the puzzle! The core is also made of deeper movers and stabilizers that control the smaller movements of the spine. Weakness in these smaller stabilizers is a common cause of muscle spasm and pain in the low back. And low back pain happens to be extremely common with >80% of people experiencing at least one episode of LBP in their lives (most being recurrent.)

Planting and Change of Direction

The laws of physics say an object in motion stays in motion. For human movement, this means if you are moving quickly in one-direction and suddenly stop, the momentum of your body still wants to carry you forward. This is notably seen in multi-directional sports like soccer, football, or even playing tag with your kids.

Changing direction quickly and safely requires a different level of core strength and stability than just bracing your abs hard. It requires strength and coordination to fire a lot of muscles simultaneously.

The CS Hip & Core System

Understanding the glutes and core might seem a bit complicated...

But have no fear, we have built a training program for solving each of these common impairments.

Learn more about the CS Hip and Core System 


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