* Russian martial arts: Specifically, Systema, known for its fluidity, adaptability, and use of pressure points, is evident in her movements.
* Kickboxing: Her powerful kicks and striking techniques are reminiscent of kickboxing.
* Judo: Black Widow's grappling and takedowns suggest knowledge of Judo.
* Other styles: It's possible she's trained in other disciplines like Krav Maga or Muay Thai.
The movie doesn't focus on a specific style, but rather on the effectiveness of Black Widow's combat skills, showcasing her adaptability, precision, and lethal efficiency.