Serena Williams had a serious case of the Mondays!

The tennis icon shared a brief peek into a day in her busy life — via a hilarious video posted to Instagram in which she is seen conducting business on the phone while lying down on a dining room table.

“My Monday-I was so tired & this was the best I could do,” Williams, 43, wrote in the caption. “Some days your best may not look as pretty as other days.”

Williams noted that she “was exhausted and quite delirious,” before she asked her 17.2 million followers how they were handling their Monday tasks and responsibilities.

Williams is seemingly keeping it real this month.

Last week, she shared with her fans the difference between social media and reality. Posting two photos on Instagram of herself on a private jet, she jokingly pointed out the difference in the two, captioning the post, “Instagram Vs Reality.”

The first photo, Williams dubbed the “Instagram” version, in which she looked poised and relaxed as she worked on her laptop draped with a cozy blanket.

In the “reality” version of the photo, Williams took a large bite of a sandwich and appeared far less put together.

Although retired from tennis, the 23-time Grand Slam champion recently opened up to PEOPLE about her need to stay competitive, something she plans to do beginning next year courtesy of running a half-marathon.

“That’s my new goal. So it’s just like I have to do something competitive. I miss tennis like crazy,” Williams told PEOPLE.

“I’ve gotten obsessed, more obsessed with diet and exercise, I think, than when I was playing tennis,” she continued.

In addition to staying on top of her health and fitness, Williams’ busy schedule also includes running her companies Wyn Beauty and Serena Ventures.