A likely answer is: based on principles of body biomechanics.
It should be noted that human body reaction for recovering balance under similar circumstances has been investigated extensively in the biomechanics and physical therapy literature.
In sum, what we know of late handaxes indicates that a flaking strategy alone (biomechanics) could not have produced these artifacts.
Biomechanics is no more and no less than a particular realm of the science of extended things.
We are not quite sure about the exact nature of the neuropathology and biomechanics underlying this movement restriction.
By partially restoring normal limb biomechanics, this prosthesis has the potential to greatly improve amputee mobility.
We had very little information about biomechanics at the time.
The profession is now much more scientifically based, with skills in wound-healing, advanced foot care (for the diabetic and vasculitic patient, for instance) and biomechanics.
