By James Ayles For Mailonline
Published: 11:39 BST, 23 August 2019 | Updated: 11:40 BST, 23 August 2019
Serena Williams took a lighter approach to her preparations for the US Open with a cartwheel over her sister Venus.
The six-time champion at Flushing Meadows demonstrated her athleticism during a gym session with her sibling and other members of the team.
Posting it on Instagram, she added the