Upon exiting the driver's side door of a standard automobile, the left leg is kinesiologically compelled to load kinetic energy at hip - something like a ski jumper crouching on descent in order to engage, generate and hold until needed, the energy necessary to contradict gravity.

Before that, as the driver lifts the left leg from the floorboard while simultaneously flinging open the door, a pronounced twisting of both the upper and lower torso occurs, the upper greater, the lower, less - this entire sequence, contraction, then flexion - of the gluteal group, then the extension of the quad...