In seven-star praying mantis system we have the typical seven-star-stance called tsat-hsing bo in cantonese and it looks similar to the stance you have in crane-style ( sorry, forgot it's name), if you stand with your weight more on the a bit flexed rear leg, the front leg is straight and you only have the heel on the ground, the tip toes show up, imagine an application as if you would put your foot upon the foot of your opponent so that he can't go backwards .