Often times I hear reference to a healthy foot by whether or not it ‘has an arch in it’. This is often in reference to one of the three arches known as the Medial Longitudinal Arch. A quick and easy way to simplify the foot is if the foot is, or becomes ‘arched’ then it is rigid. If the foot is or becomes flat then it is flexible.
A high arched, rigid foot, does not allow for torque conversion to take place in the heel bone/sub-talar joint.
Therefore the knee does not spin in… Therefore the femur does not spin in… Therefore the hip musculature is not primed with motion to assist in propulsion.