Serena Williams Shows Off Incredible Six-Pack In Steely Training Pic

Serena Williams showed fans she is looking fighting fit after her worrying exit from Wimbledon ahead of this week's Bank of West Classic in Stanford.
The world No 1 is a two-time champion at the California event which will be the first tournament in her preparations for the US Open, starting on August 25.
Williams wasn't herself at Wimbledon and was forced to withdrawal from the doubles with her sister Venus after what was cited as a 'viral illness'.
 
Serena Williams posted this image on Monday showing her toned physique