10/12/2026
Ankles collapsing during squats or running???
The tibialis posterior is the foot’s most powerful invertor and the main brake on heel roll-in (eversion) and arch collapse, the exact motion that spins the tibia inward, while strong big-toe flexors anchor the windlass mechanism to stiffen the foot and settle rotation at push-off.
Soleus lunge holds, resisted inversion/supination, and controlled toe engagement help build a stable platform so the popliteus and posterolateral corner aren’t left fighting rotation on their own.
Short-foot training has even been shown to carry over to proximal strength in runners (Sulowska et al., BioMed Research International, 2018).
An honest caveat: the foot-to-shin link isn’t a perfect 1:1 dial. Pronation magnitude doesn’t always predict tibial rotation, so pair this ground-up work with proximal hip, hamstring, and rotational control (Reischl et al., Foot & Ankle International, 1999).
Build from the ground up AND from the top down.
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