What does "it" mean?

Serena Williams has become a household name due to her incredible achievements and widespread recognition

As a popular and successful athlete, she became a sought-after endorser for major sporting goods brands.

The underdog team's championship win sparked widespread fan celebrations.

Sharapova was banned from playing for two years after a drug test found meldonium in her blood

With powerful serve, the tennis player let out a loud grunt, a common but sometimes debated vocalization in the sport

Professional golfers compete in various tournaments around the globe, vying for prize money and world ranking points.

The referee's decision in this boxing match might have caused an outcry from one of the boxers' supporters.

David Beckham dedicated much of his time and money to philanthropy, supporting youth sports programs in poor communities