She's a busy mother of three – so why does Victoria Beckham insist on always wearing sky-high heels while running errands and going shopping?

"I just can't concentrate in flats," she told the U.K.'s GMTV on Thursday.

In fact, the pint-sized pop star's shoe preference is so pronounced, she can't possibly work out.

"I'd love to go to the gym," she told the morning chat fest, "but I can't get my head around the footwear."

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