Credit: WENN

Published: Friday May 09, 2008 06:00 AM EDT

2008

WORK IT, GIRL

Madonna shows off her famously toned arms as she heads to the gym in London on Thursday. The Material Mom will need plenty of stamina when she kicks off her "Sticky and Sweet" world tour on Aug. 23 in Cardiff, Wales.

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From: Star Tracks - Friday, May 9, 2008

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