📖 Static demo — read-only snapshot
You’re browsing a static build of the Body IQ knowledge graph, so everything loads with no backend. A few things that need the live server are turned off here:
- Global search (sidebar) is disabled — it queries the API.
- The JSON API and the API “Try it” playgroundaren’t included.
- The data is a snapshot — it refreshes only when the demo is rebuilt, not live from the database.
Everything else — the body map, progression ladders, coverage heatmap, exercise finder, and all anatomy/exercise/source pages — works fully. The full app (live search + API + database) runs from the source on GitHub.
Lumbar Flexion
Lumbar Intervertebral Joints • Lumbar Spine • sagittal plane
Forward bending of the lumbar spine. Primary trunk flexion movement.
Axis: medial-lateral
Normal Range of Motion
True lumbar (not thoracolumbar) flexion by double-inclinometer technique; the widely used norm is 60 degrees (AMA Guides). AAOS lists thoracolumbar flexion as 80 degrees or a 10 cm (4 in) tape-measure excursion. The modified Schober tape method norm is approximately 6-7 cm of skin distraction; degree values apply only to inclinometer methods.
Source: AMA Guides (dual inclinometer); Norkin & White 2016
Muscles (6)
| Muscle | Role | Notes |
|---|---|---|
| Rectus Abdominis | Primary | ~1/3 of total flexor moment |
| External Oblique | Primary | ~1/3 of total flexor moment |
| Internal Oblique | Primary | ~1/3 of total flexor moment |
| Iliopsoas | Secondary | Psoas major when hip is fixed |
| Transversus Abdominis | Stabilizer | Via IAP |
| Diaphragm | Stabilizer | Via IAP |
Functional Tasks (3)
Exercises (17)
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Biomechanics of Lumbar Flexion