The Power of Hip Internal Rotation: Lessons from Sports to Daily Movement

February 2, 2025
Baseball is not the most popular sport in Australia, but as someone who grew up in South Korea and in a KIA Tigers supporting family, I’ve been watching KBO (Korean Baseball Organization) games since I was born. This year, I noticed an interesting development from one of the team’s top young players, Do-young Kim, who has dramatically improved his hitting performance.

In the 2023 season, Kim was already a talented batter, but he only hit 7 home runs with a slugging percentage (SLG) of 0.453. For those unfamiliar with baseball, a home run is when a batter hits the ball over the outfield fence, allowing them to score instantly. Slugging percentage (SLG) measures the total bases a player earns per at-bat, indicating their power-hitting ability.

Fast forward to 2024, and Kim’s stats have skyrocketed, he has hit 38 home runs with an SLG of 0.647. That’s an incredible leap!

So, what changed? After closely watching his batting stance and swing, I realised he had enhanced his hip internal rotation (HIR), allowing him to generate more torque and power in his hitting mechanics. This got me thinking, the same principle applies to improving my clients’ daily movements and sports performance.

Understanding Hip Internal Rotation (HIR) and Why It Matters


Hip internal rotation (HIR) is the movement of the femur (thigh bone) rotating inward toward the midline of the body. It plays a crucial role in sports performance, injury prevention, and even daily movement patterns.

Muscles Involved in HIR


HIR is primarily controlled by several key muscle groups:

  • Gluteus medius and minimus (stabilisers of the hip)
  • Tensor fasciae latae (TFL) (assists in internal rotation and stability)
  • Adductors (help control movement in the frontal plane)
  • Piriformis (when in a certain hip position, it assists in internal rotation)
  • Deep hip rotators (coordinate movements between the pelvis and the femur)

What Happens When These Muscles Are Weak or Overactive?


When hip internal rotators are weak, it can lead to:

  • Reduced power in sports movements such as kicking, sprinting, cycling, cutting, and pivoting
  • Limited range of motion, affecting balance and coordination
  • Increased risk of hip, knee, and lower back pain due to compensatory patterns


When these muscles are overactive, it can result in:

  • Hip impingement (pain when moving the hip in certain directions)
  • Tightness and discomfort in the lower back, glutes, or IT band
  • Increased risk of overuse injuries, such as groin strains and hamstring tightness


How HIR Improves Sports and Daily Movements


While Do-young Kim’s baseball performance demonstrates the importance of HIR in generating power, the same principle applies across various sports and everyday activities.


How HIR Affects Daily Movements


Even in non-sporting activities, poor HIR can lead to stiffness, discomfort, and inefficient movement patterns. HIR is essential for:



  • Walking and Running: Proper HIR allows the legs to move naturally, preventing excessive strain on the knees and lower back.
  • Climbing Stairs or Sitting Cross-Legged: Limited HIR can cause the knees and lower back to compensate, leading to discomfort over time.
  • Lifting or Carrying Objects: Good HIR ensures better stability and force transfer through the hips, reducing strain on the lower back.


How HIR Enhances Weekend Sports Performance


Many weekend athletes experience tight hips, knee discomfort, or lower back pain due to limited hip rotation. Addressing this can lead to improved power, balance, and reduced injury risk in the following sports:


Golf – More Power and Consistency


Golf swings require hip rotation to generate power and control. Limited HIR can lead to:

  • Loss of balance during the swing
  • Overuse of the lower back, increasing strain
  • Reduced distance and accuracy in shots


Improving HIR allows for better weight transfer, smoother rotation, and increased clubhead speed, helping golfers hit further with less effort.


Tennis – Better Agility and Stroke Power


HIR is crucial for quick directional changes and strong shots in tennis. Limited rotation can cause:

  • Slower movement when pivoting to return shots
  • Poor weight transfer, reducing shot power
  • Increased risk of hip, knee, and lower back injuries


Better HIR helps players move more efficiently, react quicker, and generate more force in serves and groundstrokes.


Footy (AFL) – Faster Cuts and Kicks


Footy requires explosive direction changes and powerful kicking. Poor hip rotation leads to:

  • Slower acceleration and agility
  • Reduced kicking distance and accuracy
  • Higher risk of hamstring, groin, and knee injuries


Enhanced HIR allows for quicker pivots, smoother strides, and more powerful kicks, improving overall agility on the field.


Running – Smoother Stride and Injury Prevention


Runners with limited HIR often compensate by overusing other muscle groups, leading to:

  • Increased stress on the knees, ankles, and lower back
  • Shortened stride length, reducing efficiency
  • Higher risk of IT band syndrome, hip pain, and lower back discomfort


By improving HIR, runners can increase stride efficiency, reduce impact stress, and improve endurance.


Cycling – Better Pedaling Efficiency and Knee Health


Cycling involves repetitive hip movement, and poor HIR can cause:

  • Knee misalignment, leading to discomfort
  • Inefficient pedaling mechanics, reducing power output
  • Tightness in the lower back and hips after long rides


Improving HIR ensures proper knee tracking, better force distribution, and smoother pedaling, reducing strain on the knees and hips.


Elite Athletes Who Rely on Hip Internal Rotation


While Do-young Kim’s baseball performance highlights the importance of HIR, other world-class athletes benefit from it as well.


  • Heung-min Son (EPL Soccer – Tottenham Hotspur): His quick dribbling, agility, and powerful shooting all rely on optimal hip internal rotation, which enhances his ability to change direction rapidly and generate force in his shots.

  • Eliud Kipchoge (Marathon World Record Holder): His efficient running mechanics depend on hip rotation to reduce energy loss, improve stride efficiency, and prevent overuse injuries.

  • Tadej Pogačar (World Tour Cycling – UAE Team Emirates): Proper HIR ensures efficient pedaling mechanics and power transfer while minimising knee and lower back strain.



How Treatment Can Enhance Hip Internal Rotation


Addressing limitations in HIR through targeted treatments can lead to significant improvements in both daily and athletic performance.


  • Massage and Myotherapy: These hands-on techniques help release muscle tightness and improve joint mobility, facilitating better hip rotation.
  • Dry Needling: Targets deep muscle tension, promoting relaxation and enhancing range of motion.
  • Chiropractic Care: Focuses on spinal and joint alignment, which can alleviate compensatory patterns affecting hip rotation.

How Good Health Group Clinic Can Assist


At Good Health Group Clinic, our multidisciplinary team offers comprehensive care to improve HIR:

  • Ian Selvarajoo, Myotherapist: Specialises in addressing muscle imbalances and enhancing mobility through tailored myotherapy techniques.
  • Dr. Tanja Nishibata, Chiropractor: Provides chiropractic adjustments and soft tissue therapy to optimize joint function and alignment.
  • Sam Noh, Remedial and Dry Needling therapist: Utilises remedial massage and dry needling to release deep-seated muscle tension and improve flexibility.


Our practitioners collaborate to create personalized treatment plans aimed at enhancing hip internal rotation, thereby improving your daily movements and sports performance.

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Conclusion


Optimising hip internal rotation is crucial for efficient movement and injury prevention in both daily activities and sports. Through targeted treatments, you can achieve better mobility, strength, and overall performance. At Good Health Group Clinic, our experienced practitioners are dedicated to helping you reach these goals through personalised, integrative care.


References


  • Cibulka, M. T., & Threlkeld-Watkins, J. (2005). Patellofemoral pain and asymmetrical hip rotation. Physical Therapy, 85(11), 1201-1207.
  • Kumagai, M., Shiba, N., Higuchi, F., Nishimura, H., & Inoue, A. (1997). Functional evaluation of hip joint rotation for walking. American Journal of Physical Medicine & Rehabilitation, 76(5), 386-391.
  • Philippon, M. J., Schenker, M., Briggs, K. K., & Kuppersmith, D. A. (2007). Hip arthroscopy for labral tears in patients aged 50 years or older. Arthroscopy: The Journal of Arthroscopic & Related Surgery, 23(5), 530-535.


Blogs

By Ian Selvarajoo September 4, 2026
The Real Mechanism Stiffness on waking isn't damage, and it isn't really "just getting older" in the vague sense people mean it. It's a fluid and movement-frequency problem. Every hour spent still in one position lets your discs, joints, and fascia settle into a compressed or dehydrated state. Intervertebral discs in particular rely on nocturnal rehydration through osmosis while unloaded — around a quarter of a disc's fluid is expressed and re-absorbed with each daily loading cycle (1), and that process becomes less efficient with age as disc water content and hydration capacity decline (2). On top of that, deep sleep (slow-wave sleep) — when growth hormone release peaks and tissue repair happens — declines significantly with age. Research tracking healthy men found the amount of deep slow-wave sleep dropped from around 19% of total sleep in early adulthood to roughly 3-4% by midlife, alongside a corresponding decline in growth hormone secretion (3). By around age 45, most people have lost the majority of their capacity to generate deep sleep, and growth hormone secretion during sleep falls by a similar magnitude (4). Since tissue repair is concentrated in this stage, overnight recovery of muscle and connective tissue is naturally reduced as you age. There's also a movement piece: younger people shift position far more during sleep, which redistributes joint loading and fluid through the night. Position shifts and body movements during sleep decrease progressively with age (11, 12), and older adults spend more time in a single position — particularly side-lying — with fewer overall shifts per hour than younger adults. That means the same posture, and the same load on the lumbar spine and hips, gets held for longer periods. Add in the joints themselves: synovial fluid depends on hyaluronic acid for its lubricating viscosity, and both the concentration and molecular size of hyaluronic acid in joint fluid decline with age — one study found hyaluronan concentration dropping by roughly 10% per decade, more strongly linked to age than to visible joint degeneration (5, 6). Fascia undergoes its own aging process too: collagen cross-linking increases, elastin content drops, and tissue hydration declines, all of which reduce fascial pliability and increase stiffness and adhesion formation (9, 10). Layered on top of all this is "inflammaging" — the low-grade, chronic inflammatory state that becomes more pervasive with age, contributing to stiffness and tissue degeneration even without any specific injury (7, 8). Why Stillness Is the Real Culprit None of this is really about sleep quality in isolation — it's about how much time tissue spends static without fluid exchange. That reframes the problem: instead of "sleep is the cause and there's not much to do about it," the actual lever is controllable. You can reduce how much stiffness builds up overnight, and you can clear it much faster once you're awake, by deliberately bracketing sleep with movement. Before Bed: Reducing How Much Stiffness Accumulates Spending 5-10 minutes on slow mobility work before sleep — targeting the areas that hold tension longest overnight, typically the hips, lumbar spine, and thoracic spine — primes fluid distribution and synovial lubrication before hours of stillness set in, rather than trying to undo the damage after the fact. Movements like cat-cow, hip flexor stretches, and gentle spinal rotations are enough; this isn't about building flexibility, it's about starting from a better baseline. As a secondary benefit, this kind of slow mobility work activates the parasympathetic nervous system, which can also improve how easily you fall asleep in the first place. On Waking: Clearing Stiffness Fast Instead of Waiting It Out Most people's instinct is to just get up and move through the day, letting stiffness fade naturally — but that process can take 30-60+ minutes or longer as you age. A short, structured sequence immediately on waking can clear it in a fraction of that time. The logic is to start with gentle, low-effort movement (light stretching or distal movement like ankle pumps), progress into the areas that were under the most sustained load overnight (usually the lower back and hips), and finish with a compound movement that reintroduces full-body loading — something like a slow sit-to-stand or a few controlled squats. The order matters here. Mobilizing the spine and hips before standing and loading them prevents the "guarded," stiff-walking pattern many people default to when they get up too stiff too fast — which can itself create secondary tension as the body compensates. The Bottom Line Age-related morning stiffness is driven by reduced disc and joint hydration, less deep sleep, reduced overnight movement, and slower fascial recovery — all of which compound over time. But the single most practical, controllable lever isn't just "sleep better," it's minimizing prolonged stillness and treating both bedtime and waking as deliberate windows to manage fluid exchange and joint lubrication through movement. References Sivan SS, Neidlinger-Wilke C, Würtz K, Maroudas A, Urban JPG. Diurnal fluid expression and activity of intervertebral disc cells. Biorheology, 2006;43(3-4):283-291. https://pubmed.ncbi.nlm.nih.gov/16912401/ Iatridis JC, et al. Effect of Hydration on Healthy Intervertebral Disk Mechanical Stiffness. PubMed, 2015. https://pubmed.ncbi.nlm.nih.gov/26300418/ Van Cauter E, Leproult R, Plat L. Age-Related Changes in Slow Wave Sleep and REM Sleep and Relationship With Growth Hormone and Cortisol Levels in Healthy Men. JAMA, 2000;284(7):861-868. https://pubmed.ncbi.nlm.nih.gov/10938176/ UChicago Medicine. Aging alters sleep and hormone levels sooner than expected. 2000. https://www.uchicagomedicine.org/forefront/news/2000/august/aging-alters-sleep-and-hormone-levels-sooner-than-expected Temple J, et al. Hyaluronan concentration and size distribution in human knee synovial fluid: variations with age and cartilage degeneration. Arthritis Research & Therapy, 2016. https://arthritis-research.biomedcentral.com/articles/10.1186/s13075-016-0922-4 An update on the study of synovial fluid in the geriatric patient. ScienceDirect, 2024. https://www.sciencedirect.com/science/article/abs/pii/S1699258X23002899 Franceschi C, Campisi J. Chronic inflammation and the hallmarks of aging. ScienceDirect (review), 2023. https://www.sciencedirect.com/science/article/pii/S2212877823000893 Source of Chronic Inflammation in Aging. PMC, 2018. https://pmc.ncbi.nlm.nih.gov/articles/PMC5850851/ Wilke J, et al. Structural and Functional Changes in the Coupling of Fascial Tissue, Skeletal Muscle, and Nerves During Aging. Frontiers, 2020. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7327116/ Pavan PG, et al. (as cited in fascia/aging review) — fascial densification and fibrosis with age. https://d-nb.info/1232323802/34 Bruyneel M, et al. Sleep positions and nocturnal body movements based on free-living accelerometer recordings: association with demographics, lifestyle, and insomnia symptoms. Nature and Science of Sleep, 2017. https://pubmed.ncbi.nlm.nih.gov/29138608/ Gyllensten IC, et al. Body movements during night sleep and their relationship with sleep stages are further modified in very old subjects. ScienceDirect, 2007. https://www.sciencedirect.com/science/article/abs/pii/S0361923007002304
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Strengthen Weak Muscles Trigger points often form because a muscle is both tight and weak . That means stretching alone isn’t enough—you also need strength training . Example: Instead of constantly stretching tight hip flexors, incorporate glute and core strengthening exercises . How Good Health Group Clinic Brighton Can Help At Good Health Group Clinic Brighton , we take an evidence-based approach to muscle health and mobility. Our team of skilled practitioners can help with: Myotherapy : Our myotherapist Ian Selvarajoo specialises in releasing muscle knots using advanced soft tissue techniques. Chiropractic S ports and Spinal rehab : Dr. Tanja Nishibata can assess your posture and spinal health, ensuring your nervous system and musculoskeletal system function optimally. Remedial Massage & Dry Needling : Sam Noh provides expert remedial therapy and dry needling to address chronic muscle tension and improve flexibility. 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