In George Silver's Paradoxes of Defense he makes the following comment:
And again, the thrust being made through the hand, arm, or leg, or in many places of the body and face, are not deadly, neither are they maims, or loss of limbs or life, neither is he much hindered for the time in his fight, as long as the blood is hot.
Blows to the leg are frequently remarked to be either life-threatening (esp. for slashes) or, essentially, trivial (esp. for thrusting).
This indicates to me that when training realistic targeting for a court sword (blades similar to an epee) the legs should probably be avoided in the entirety, but I wonder if that is necessarily true for a broader rapier blade or a thrusting weapons in general if narrowing the focus to something smaller than "leg"? Are there effective targets in the leg for these, or are the actual life/limb-threatening targets sufficiently small and mobile that they should generally be eschewed as actual attacks for the thrust in favor of higher margin targets?