Extend
         your lower limb
         your heel raised off the floor.

Note;
        prominence and tautness
        in the     line of your thigh
        as the heel              rises.

Watch;
        the line          vanishes
        to an     indistinct ridge
        as your heel descends.

Tracing,
        your                  Quadriceps Femoris
        (Latin, four-headed femoral muscle)
        with                         a steady finger.

It contracts
        in your                      palpable
        extension against resistance.
        An action is elicited,
                        is tested.

The Quadriceps,                        thus,
through its Patellar union, is allowed
an       approach         from a position
of greater mechanical      advantage.

Rendering your extension against resistance
                             futile.