With the start of the 2021 season kicking off next week, players have been posting proof of their training and practice sessions on social media.

Serena and Venus Williams are flexing their hard work a little bit differently this time around. 

"I was told I don’t share enough of my training," the 23-time Grand Slam champion wrote. "I hope this helps y’all know I’m serious."

While no one should ever doubt Serena's work ethic, she does get some flak for being distracted by her many off-court passions.

Her sister Venus followed suit, with what must be a tinge of good-humored mockery at her little sister: 

Though the WTA season starts in Abu Dhabi on January 5, neither of the sisters are entered in the WTA 500.