What is Biomechanics and How Does it Affect You Every Day?

last updated June 19 0 comments

what is biomechanics

Have you ever stopped to wonder what is biomechanics and how it allows you to perform even the simplest tasks like walking across the room? Each step, from heel strike to push-off, involves a complex interplay of muscles, bones, and physics. This intricate dance of our human body in motion is governed by a fascinating science called biomechanics.

Biomechanics explores and uncovers the how and why of human movement. It unlocks the secrets behind every jump, throw, and even the way we sit or stand. By understanding the principles of biomechanics, we gain a profound appreciation for the body's ingenious design, capable of both delicate balance and explosive power.

But biomechanics isn't just about athletic feats. It's relevant to our everyday lives as well. From the way we lift groceries to the hours spent hunched over a computer, our posture and movement patterns significantly impact our biological systems and health. Throughout this article, we'll explore the captivating world of biomechanics, unveiling the hidden forces and internal dynamics that orchestrate every move we make. We'll also dig into the crucial link between posture and biomechanics, revealing how our body alignment affects how we move and vice versa.

Core Principles of Biomechanics: The Building Blocks of Movement

Biomechanics isn't just about fancy jargon; it relies on fundamental principles that govern how our bodies move. These principles form the building blocks for understanding even the most complex athletic maneuvers. Let's jump into some key concepts:

biomechanics of gait

Forces and Torques: 

Imagine the push-off during a jump. This action results from the force generated by your leg muscles. Biomechanics analyzes how both internal forces (generated by muscles) and external forces (gravity, ground reaction force) act on the body. Understanding these forces and how they interact is crucial for efficient movement. Additionally, torques (twisting forces) play a role in rotating body segments, allowing us to throw a ball or turn our torso.

Newton's Laws of Motion: 

Remember those physics lessons about Sir Isaac Newton? It turns out his laws of motion are just as relevant on the playing field as they are in a classroom. Newton's First Law (Law of Inertia) explains why a body at rest tends to stay at rest, while the Second Law (Law of Acceleration) tells us how force influences the acceleration of an object (like our bodies). Biomechanics applies these principles to understand how forces acting on us can cause us to start moving, stop moving, or change direction.

Center of Gravity (CoG): 

Imagine your body as an inverted pendulum. Our center of gravity is the point where all our weight seems to be concentrated. Maintaining a balanced CoG is vital for stability. Biomechanics helps us understand how posture and movement patterns affect our CoG, influencing our balance and risk of falls.


While biomechanics focuses on the mechanical aspects of movement, a closely related field called kinesiology takes a broader approach. Kinesiology encompasses the study of human movement from various perspectives, including anatomy, physiology, and psychology. Understanding both biomechanics and kinesiology provides a comprehensive picture of how our bodies move.

The Fascia Factor: Unveiling the Body's Interconnectedness

fascial lines biomechanics

Biomechanics traditionally focused on the interplay of bones, muscles, and joints. However, recent biomechanics research has shed light on the crucial role of another player: fascia. This extensive network of connective tissue weaves throughout our bodies, encasing muscles, organs, and bones. Fascia was once thought to be a passive structure, but it's now recognized as a dynamic system that plays a vital role in the application of biomechanics in areas like human motion.

Think of fascia as a spiderweb that connects everything. Fascia's structure and tension can significantly impact our biomechanics in areas of locomotion and injury prevention. Tight or restricted fascia can limit joint mobility and hinder efficient movement. Conversely, healthy and supple fascia allows for the smooth gliding of muscles and transmits forces effectively, leading to powerful and coordinated movements.

From Newton's Physics to Einstein:

The concept of Anatomy Trains, described by Thomas Myers, further emphasizes this interconnectedness in all living organisms. Myers suggests that fascia isn't just a random network, but rather a series of interconnected lines (trains) that course throughout the body affecting muscle forces. This concept highlights how seemingly isolated movements can actually affect other areas through these fascial connections. In essence, it emphasizes a "relativity" within the body - an action in one area can have a ripple effect on other seemingly unrelated areas.

Understanding the importance of fascia and its interconnected nature adds a new dimension to motion analysis and the study of biomechanics, reminding us that our bodies truly function as a unified system.

The Power of Posture: Biomechanics in Action

biomechanics and posture

Imagine a finely tuned sports car. When all its parts are perfectly aligned and working together, the car runs smoothly and efficiently. But if the wheels are misaligned or the engine is out of tune, the car sputters and struggles to perform at its best. Our bodies function similarly. Posture, the way we hold ourselves upright, plays a significant role in biomechanics.

Good posture, with proper spinal alignment and balanced weight distribution, allows for efficient movement and optimal biomechanics. Here's why:

  • Improved Efficiency: Good posture allows for optimal muscle recruitment and proper joint alignment. This translates to smoother, more coordinated movements that require less energy expenditure. In contrast, poor posture can lead to muscle imbalances and inefficient movement patterns, requiring more effort for even basic tasks.
  • Reduced Injury Risk: When our body is properly aligned, forces are distributed evenly across our joints. Poor posture, on the other hand, can place excessive stress on certain joints and ligaments, increasing the risk of injuries.

The Body as a Kinetic Chain: 

While good posture is crucial overall, specific postural imbalances can affect movement patterns in different regions. For example:

  • Lumbopelvic Rhythm: This refers to the coordinated movement between the pelvis and spine during activities like walking and running. Poor posture in the lower back can disrupt this rhythm, leading to inefficiencies and potential pain in the lower back and hips.
  • Scapulohumeral Rhythm: This term describes the coordinated movement between the shoulder blade (scapula) and the upper arm bone (humerus) during arm movements like throwing or reaching. Imbalances in posture, particularly in the upper back and shoulders, can disrupt this rhythm, impacting shoulder mobility and potentially leading to pain.

Understanding these connections between posture and biomechanics empowers us to take an active role in maintaining good posture. By promoting proper alignment and addressing postural imbalances, we can move with greater ease, reduce our risk of orthopedic injuries, and optimize our overall health with improved breathing, blood flow, and healing.

Applications of Biomechanics: Beyond the Theory

The field of biomechanics isn't just a fascinating area of study; it has a multitude of practical applications that impact our everyday lives. Let's explore how this science is harnessed in various fields:

exercise therapist activ8 posture

Sports Biomechanics: 

Imagine a baseball player optimizing their swing for maximum power or a runner refining their stride for peak efficiency. Sports biomechanists use sophisticated techniques to analyze athletes' movements, identify areas for improvement, and design training programs to enhance sports performance while minimizing injury risk.


Ever felt achy after a long day hunched over a desk? Ergonomics applies biomechanics to the design of workplaces. By understanding how our bodies interact with furniture and equipment, ergonomists create workstations that promote good posture, reduce strain on muscles and joints, and ultimately, prevent work-related injuries.

Traditional Physical Therapy

Physical therapists are experts in movement dysfunction, and traditionally, they've focused on addressing the area of pain or injury. Through manual therapy, targeted exercises, and modalities like ultrasound, they aim to improve flexibility, strengthen muscles, and restore function in the affected area. This approach is highly effective for treating specific injuries and biomechanical imbalances.

Posture Alignment Therapy - A Holistic Approach: 

Often overlooked, posture alignment therapy has emerged as a specialized approach within sports medicine that takes a more comprehensive view of biomechanical principles. This unique method incorporates exercises, stretches, and techniques to improve posture and alignment throughout the body, not just the symptomatic area. By addressing these underlying postural imbalances, posture alignment therapy can promote pain relief in various areas, improve overall mobility and stability, and ultimately, prevent future injuries.

Biomechanics empowers us to move with greater awareness, efficiency, and less risk of injury. From optimizing athletic performance to creating comfortable workspaces and utilizing posture alignment therapy, this application of exercise science plays a vital role in keeping our bodies moving optimally throughout our lives.

Conclusion: Demystifying Movement - The Power Within

Biomechanics unveils the fascinating science behind how our bodies move. From the intricate interplay of muscles and bones to the influence of fascia and posture, this field unlocks a deeper understanding of human movement. By harnessing these principles, we can move with greater efficiency, reduce our risk of injuries, and even enhance our athletic performance.

Whether you're a weekend warrior or striving for pain-free movement in your daily life, someone looking to prevent injuries, or simply aiming to improve your everyday well-being, biomechanics empowers you to take charge of your body. With posture alignment therapy, you're able to explore how you can achieve optimal alignment and movement patterns -- and change often happens faster than you might think!

align & achieve

Ready to Unlock Your Body's Full Potential?

At Activ8 Posture, we offer a free consultation and posture assessment to help you understand your unique posture and biomechanics. We then explore personalized solutions for improved movement and pain relief.

Schedule your free consultation today and take the first step towards a life of optimal movement!

Biomechanics FAQs: Understanding Movement from the Inside Out

What is biomechanics?

Biomechanics is the biological science that explores how our bodies move. It analyzes the complex interplay of forces (internal and external), muscles, bones, and posture to understand how we generate movement and maintain stability.

How are biomechanics and posture related?

Posture is the foundation of biomechanics. Proper posture ensures your body is aligned correctly, allowing for efficient and pain-free movement. Conversely, poor posture disrupts this alignment, leading to muscle imbalances, joint strain, and potentially, pain.

What is an example of biomechanics?

Gait, the way we walk, is a perfect example of biomechanics in action. When you walk with good posture, your weight is distributed evenly across your feet and legs, allowing for a smooth and efficient stride. However, slouching can disrupt this balance, placing excessive stress on your lower back and potentially leading to pain or injury.

How does poor posture affect biomechanics?

Poor posture can negatively impact biomechanics in several ways:

  • Muscle imbalances: Slouching, for example, can tighten chest muscles and weaken back muscles, leading to imbalances that can affect movement and stability.
  • Joint strain: Misaligned posture puts undue stress on certain joints, increasing the risk of pain and wear-and-tear.
  • Reduced efficiency: When your body is out of alignment, it has to work harder to maintain balance and perform movements, leading to chronic pain, fatigue, and decreased performance.

What are kinetic chain, kinematics, and human kinetics?

These terms are all related to biomechanics but have slightly different meanings:

  • Kinetic chain: This refers to the interconnected network of muscles and joints that work together to produce movement. Imagine a chain reaction – when one joint moves, it affects the movement of the joints above and below it. Good posture ensures this chain functions smoothly.
  • Kinematics: This is primarily the quantitative study of motion itself, focusing on the how (not the why) of movement. Kinematics describes things like joint angles, velocities, and accelerations, providing valuable data for biomechanical analysis. While kinematics might include some qualitative observations about the nature of the movement (e.g., flexion, extension, abduction), its core focus lies in quantifying the movement characteristics.
  • Human kinetics: This is a broader field that encompasses the study of forces acting on the human body during movement. It incorporates concepts from biomechanics, physics, and anatomy to understand how forces like gravity and muscle contractions influence human movement.

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