FSHP Academy
Human Anatomy — all lessons

Foundations of Anatomy

Anatomical terminology, planes, axes and movement directions

The Skeletal System

Skeletal system: structure and functionsBone structure, remodelling and adaptation to loading

Joints and the Muscular System

Joint types and classificationJoint mechanics: arthrokinematics and stabilityThe muscular system: organisation and major muscle groupsMuscle architecture: pennation, length and cross-sectional areaMuscle fibre types

Regional Functional Anatomy

Spine and postureThe shoulder complexThe hip complexThe knee complexThe ankle and foot complexCore and pelvic stabilityElbow and wrist functional anatomyCervical and thoracic spine functional anatomy

Core and pelvic stability

What the “core” actually is, how trunk muscles create stiffness and transfer force, the evidence on core training for back pain and performance, and how to programme it.

Intermediate Evidence: Strong evidence 3 min read Reviewed 2026-10-31 Status: draft

Learning objectives

  • Define the core and list its muscular components, including the diaphragm and pelvic floor
  • Explain intra-abdominal pressure and trunk stiffness
  • Summarise the evidence on stabilisation exercise for low back pain
  • Programme anti-movement, movement and integrated core training

Before this lesson

Why this matters

“Core strength” is everywhere in fitness marketing. Understanding what the core is — and what the evidence supports — lets you train it effectively without overselling it.

Fundamental concepts

Think of the core as a pressurised cylinder [kibler2006]:

  • Front and sides — rectus abdominis, external and internal obliques, transversus abdominis.
  • Back — erector spinae, multifidus, quadratus lumborum.
  • Top — diaphragm.
  • Bottom — pelvic floor muscles (see pelvic floor).
  • Links to limbs — hip muscles (gluteals, iliopsoas) and latissimus dorsi via the thoracolumbar fascia.

The science: stiffness and force transfer

When core muscles co-contract and the diaphragm and pelvic floor engage, intra-abdominal pressure (IAP) rises, stiffening the trunk. A stiff trunk acts as a stable link that transfers force between legs and arms — e.g., from the ground through the trunk into a throw [kibler2006].

In a classic study, people with low back pain showed delayed transversus abdominis activation during rapid arm movements [hodges1996]. This led to specific “TrA activation” programmes. However, systematic reviews show that while stabilisation exercises help back pain compared with minimal intervention, they are not clearly superior to other forms of exercise in the long term [smith2014].

Three ways to train the core

CategoryPurposeExamples
Anti-movementResist unwanted motionPlank (anti-extension), side plank (anti-lateral flexion), Pallof press (anti-rotation), suitcase carry
MovementProduce trunk motion under loadCable woodchop, back extension, controlled sit-up variations
IntegratedCore as force transmitterSquats, deadlifts, overhead press, med-ball throws, sprinting

Practical application

Common mistakes and misconceptions

  • “Draw your belly button to your spine during every lift.” Hollowing can reduce trunk stiffness under heavy load; bracing is more appropriate for heavy lifting.

Case study

A rugby player can hold a 4-minute plank but loses trunk position in tackling and sprinting. The coach replaces long planks with heavy carries, Pallof press variations, med-ball rotational throws and single-arm presses — training force transfer under realistic loads.

Further learning: video lessons

Video links are only marked “verified” after a human has watched them. Unverified entries open a YouTube search for that channel and topic rather than a guessed link.

Introductory needs verification — opens a YouTube search

What is the core? Anatomy and function

Kenhub

You will understand: the muscles that make up the core

Why: Clear anatomical overview.
Practical demo needs verification — opens a YouTube search

Core training: anti-extension, anti-rotation, anti-lateral flexion

E3 Rehab

You will understand: a structured way to programme core exercises

Why: Evidence-informed physiotherapist-led content.

Knowledge check

Knowledge check · 0/5

1. Which structure forms the “roof” of the core cylinder?

Answer B. The diaphragm forms the top; the pelvic floor forms the base.

2. A Pallof press mainly trains…

Answer B. It is an anti-rotation exercise.

3. Meta-analysis evidence suggests stabilisation exercise for chronic low back pain is…

Answer B. Smith et al. (2014) found short-term benefits over minimal intervention but no long-term superiority over other exercise.

4. Hodges and Richardson (1996) reported that in people with low back pain, transversus abdominis activation was…

Answer A. This finding popularised “TrA activation” training, though later evidence showed general exercise works similarly for pain.

5. Brief breath-holding (bracing with Valsalva) during maximal lifts…

Answer A. It stiffens the trunk for heavy lifts but transiently raises blood pressure — unsuitable for some clients.

Short-answer & application questions

  1. Design a core progression from beginner to advanced that includes all three categories of core training.
  2. Explain to a client with back pain why the type of exercise matters less than doing exercise they enjoy and progress.
  3. How would you adapt bracing cues for a client with hypertension?

Key takeaways

  • The core is a muscular cylinder — abdominal wall, back extensors, diaphragm (top) and pelvic floor (bottom) — plus the hip muscles that link it to the legs.
  • Co-contraction and intra-abdominal pressure stiffen the trunk to transfer force between limbs.
  • Stabilisation exercise helps low back pain, but generally not more than other forms of exercise.
  • Train the core in multiple ways — resisting movement, producing movement, and integrated in lifts and carries.

Connected topics

womens health · planned

Pelvic floor anatomy

corrective exercise · planned

Lumbar spine

functional training

Fundamental movement patterns: push, pull, squat, hinge

pilates · planned

T-zone activation and breathing pattern

References

  1. Kibler WB, Press J, Sciascia A (2006). The role of core stability in athletic function. Sports Medicine, 36(3):189–198. Narrative review check pending
  2. Hodges PW, Richardson CA (1996). Inefficient muscular stabilization of the lumbar spine associated with low back pain: a motor control evaluation of transversus abdominis. Spine, 21(22):2640–2650. Classic study check pending
  3. Smith BE, Littlewood C, May S (2014). An update of stabilisation exercises for low back pain: a systematic review with meta-analysis. BMC Musculoskeletal Disorders, 15:416. doi:10.1186/1471-2474-15-416 Meta-analysis check pending

Educational content only — not medical advice. Consult a qualified clinician for diagnosis or treatment.