Interactive biomechanics resource
Adductor longus and biceps femoris during running.
Explore how two muscles change length and function across a simulated running gait cycle. Adjust speed and body mass, compare the traces and inspect each phase in 3D.
What this resource shows
A visual bridge between gait mechanics and muscle function.
The model follows the adductor longus and the long head of biceps femoris through stance and swing. It visualises muscle-tendon length, schematic activation, contraction behaviour, moment arms and theoretical force outputs.
Use the controls: rotate the model, pause or scrub the cycle, isolate either muscle and adjust the running speed or body mass used by the simulation.
Interactive model
Explore the running cycle.
Best viewed on a modern desktop or tablet. The model also works on mobile, with the data panels placed below the 3D view.
Interpretation
What can—and cannot—be inferred.
Educational model, not an athlete measurement
- The anatomy is based on a generic musculoskeletal model, not a scan or calibration from an individual athlete.
- Running kinematics and activation envelopes are generated or schematic; they are not motion-capture or EMG recordings.
- Force and joint-moment values are theoretical outputs from the model. They have not been validated for diagnosis, load prescription or return-to-play decisions.
- Changing speed or mass illustrates model sensitivity; it does not predict a person's injury risk.
Evidence base
Primary sources and model provenance.
- Hamner SR, Seth A, Delp SL. Muscle contributions to propulsion and support during running. Journal of Biomechanics. 2010;43(14):2709–2716.
- OpenSim Full Body Running Model and the published model file.
- Schache AG et al. Mechanics of the human hamstring muscles during sprinting. Medicine & Science in Sports & Exercise. 2012;44(4):647–658.
Scientific and wording review: 26 September 2026. The interface is an educational visualisation; it does not claim to reproduce every output of the cited studies.
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