Soleus
The soleus is a calf muscle lying mainly beneath gastrocnemius and joining the calcaneal tendon.
Definition
It contributes to plantar flexion and postural control. Knee position changes the relative mechanical contribution of calf muscles but does not completely isolate the soleus.
NCBI Bookshelf · Posterior leg compartment
Evidence and use
Calling it an endurance muscle is a simplification; fibre composition and function vary. Soleus training does not by itself guarantee faster running, injury prevention or HYROX® performance.
NCBI Bookshelf · Posterior leg compartment
Bend your knee to at least 90 degrees during calf exercises. Seated calf raises, wall sit calf raises, and bent-knee calf raises all preferentially target the soleus. Repz run split data can reveal if late-race pace decline correlates with calf fatigue patterns.
FAQ
What does this term mean?
It has the bounded meaning described above; it does not establish the removed guarantees.
NCBI Bookshelf · Posterior leg compartment
How should it be used in training?
Apply it according to the specific task, goal, current capacity and response rather than a universal prescription.
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