Built to Move: Understanding the Squat, Deadlift, and Hinge

Think about everything you've asked your body to do today. Maybe you squatted down to grab something from the oven, picked up a laundry basket, or leaned over the bathroom sink to wash your face. You probably didn't think twice about any of those movements. But what if I told you that these ordinary activities involve the same foundational movement patterns we train in the gym?

At Empowered Physical Therapy, we believe understanding how your body moves, which muscles are responsible for controlling that movement, and how to appropriately challenge those muscles is fundamental to building strength that supports you throughout your life.

What Are Functional Movement Patterns?

Functional movement patterns are the foundational ways our bodies move to accomplish everyday tasks. Rather than isolating individual muscles, these movements require multiple joints and muscle groups to work together. Today, we're focusing on three fundamental lower-body patterns: the squat, deadlift, and hinge.

Although these movements may look similar, understanding their differences can change how you approach strength training.

Squat vs. Deadlift vs. Hinge: What's the Difference?

One of the most common misconceptions I encounter is that a squat and a deadlift are differentiated by where the movement starts. A squat starts from standing and moves downward, while a deadlift starts from the ground and moves upward. While that may describe how these exercises are commonly performed, it doesn't explain their mechanical differences.

The more meaningful distinction is how much movement occurs at the hips compared to the knees.

All three patterns involve both hip and knee flexion. What changes is the relative contribution of each joint. To simplify this concept, I use a hip-to-knee ratio model when educating clients.

Squat | 1:1

In a squat, we're looking for relatively equal movement through the hips and knees. For every degree of hip flexion, we can think about approximately one degree of knee flexion. Visually, the shin and torso angles are relatively parallel. Think about squatting down to reach into a lower cabinet or sitting down in a chair.

Deadlift | 2:1

The deadlift shifts the emphasis toward the hips. For every two degrees of hip flexion, we can think about approximately one degree of knee flexion. Compared to the squat, the hips move farther backward, the torso inclines forward, and the knees contribute proportionally less movement. Think about lifting a heavy laundry basket or box from the floor.

Hinge | 3:1

The hinge, commonly trained through exercises like the Romanian deadlift (RDL), places even greater emphasis on the hips. For every three degrees of hip flexion, we can think about approximately one degree of knee flexion. The hips move backward while the shins remain relatively vertical with a slight bend in the knees. Think about leaning over the bathroom sink to wash your face.

These ratios are simplified teaching tools, not exact biomechanical requirements. Individual anatomy and exercise variations influence how each movement looks.

Why Does Joint Positioning Matter?

Because changing how you move changes how you're challenging your muscles.

For simplicity, let's focus on two major muscular systems. The anterior chain, particularly the quadriceps, contributes to knee extension, while the posterior chain, including the glutes and hamstrings, contributes to hip extension.

Both muscle groups participate in all three patterns, but their relative demands change with joint positioning. Squatting generally emphasizes the quadriceps more than a hip-dominant hinge, while hinging places greater emphasis on the posterior chain.

Understanding this relationship helps us move beyond simply completing an exercise and toward intentionally challenging the muscles responsible for it.

It's Not Just About Getting Into Position

Most people can imitate a squat, deadlift, or hinge after watching someone demonstrate it. But reproducing the appearance of a movement doesn't necessarily mean someone understands how to control or load it effectively.

Consider the hinge. I frequently see people bend forward with nearly straight knees, reach toward the floor, and tell me they can really feel their hamstrings. But feeling a muscle stretch isn't necessarily the same as effectively loading it. Others bend their knees excessively, turning what was intended to be a hinge into something closer to a squat.

Neither strategy is automatically wrong, but it may not accomplish the intended goal of the exercise.

This is why we emphasize muscular awareness and movement control at Empowered. We want people to understand not only how to get into a position, but also how their muscles control the descent and generate force to return to standing.

For example, during a squat, the quadriceps help control the lowering phase as they lengthen under tension (eccentric contraction) and help drive the body upward as they shorten (concentric contraction). The posterior chain performs similar functions at the hips during hinging movements.

The goal isn't necessarily to feel every muscle working during every repetition, but developing that awareness can be a valuable tool for improving movement competency.

Learning to Move Is the Foundation. Loading the Movement Builds Strength.

Once you've learned how to perform these patterns, the next question becomes: Are you challenging your muscles enough to create meaningful adaptation?

This is where progressive overload comes in. Progressive overload means gradually increasing the demands placed on your body as it becomes stronger. We can accomplish this by increasing resistance, repetitions, training volume, or exercise difficulty.

A bodyweight squat may initially be challenging, but as your strength improves, additional resistance may be necessary to continue progressing. The same principle applies to deadlifts and hinges.

Heavier resistance can be particularly effective for developing maximal strength, but the appropriate load depends on your experience, capacity, and goals. The objective isn't to lift as much weight as possible every time you exercise. It's to challenge your body intentionally, consistently, and progressively.

Built to Move. Built for Life.

Ultimately, we're not training these movement patterns just to become better at exercising. We're developing the strength and physical capacity to carry groceries, move furniture, keep up with our kids, pursue the activities we love, and maintain independence as we age.

There's also no single perfect way to squat, deadlift, or hinge. Our anatomy, strength, mobility, and experience all influence how we move. At Empowered, our goal isn't to force everyone into identical positions. It's to help people better understand their bodies and develop the strength and control needed to accomplish their individual goals.

The next time you squat, deadlift, or hinge, think beyond simply completing the exercise. Consider how you're moving, which muscles are contributing, and whether you're challenging yourself appropriately.

Don't just train to lift more. Train to live more.

At Empowered Physical Therapy, we're passionate about helping people understand their bodies, move with intention, and build lasting strength. Whether you're recovering from an injury, returning to exercise, or working toward your next performance goal, we're here to help you move forward with purpose.