Take a small screwdriver or similar to pull out the red pin that holds the legs.
Helps to lay down the fig on edge of a table and push down at the pin with your
tool.
Then take a plier and press multiple times over the pin edges. Press firmly so
that it it leaves groves at the pin. Then assemble again and the legs are stiff
as new!
This trick actually works for ordinary minifig legs that have become too loose
also.
Hungary, Békés
Sweden, Västra Götaland