Martina Navratilova was a high-profile force on the tennis court in the 1970s and 80s with 59 Grand Slam titles. She has remained a big presence in the tennis world, commentating and mentoring, and is using her platform to weigh in on issues off the court as well. Amna Nawaz sat down with Navratilova for our culture of sport coverage, part of our CANVAS series.