Raze

This isn't a real superwoman movie, but I think some of us here might like it since its concept is most used in male dominated films.

A groups of women from various backgrounds are kidnapped and taken to a hidden location and force to fight to death in one on one fights with no weapons.
It stars Rachel Nichols, Zoe bell and Rebbecca Marshal. The actreses do most of their own fighting in close quarters.
Its airing on the Showtime channels this mouth and is even on tonight at 9:05 PM central time on one of them.

I saw this movie, while not a good movie by any standard, the figths between the girls are BRUTAL! I particulary liked the "evil" one who was having a blast crushing the other fighters