Serena Williams stepped out of her comfort zone to deliver an important message.

On Saturday, the 37-year-old tennis ace shared a topless video of herself singing the Divinyls’ “I Touch Myself,” as part of a project to raise awareness for breast cancer.

“This Breast Cancer Awareness Month I’ve recorded a version of The Divinyls’ global hit ‘I Touch Myself’ to remind women to self-check regularly,” Williams’ post began.

“Yes, this put me out of my comfort zone, but I wanted to do it because it’s an issue that affects all women of all colors, all around the world. Early detection is key – it saves so many lives. I just hope this helps to remind women of that,” she continued.

Williams added the video is part of the “I Touch Myself” project, which was created by Divinyls singer Chrissy Amphlett, who died in 2013 following a lengthy battle with breast cancer. She was 53 years old.

As of Sunday, Williams’ video has been viewed over 1.8 million times.