Britney Spears has published a video of her working out ahead of the release of her new album.

The video, released on the singer's website, has increased speculation that Spears will embark on an extensive tour in support of the her new LP.

Last month, Spears told a US radio station that touring was “definitely” something she wanted to return to.

When asked where she would like play, she said a tour would probably include cities “around the world.”

A message on Spears' website says the singer has been undergoing “intense” dance rehearsals “many” times a week.

As previously reported, Spears will make a special guest appearance on The X Factor next month.

Her album is due to be released on December 2nd – the singer's 27th birthday - in the US.

Spears' comeback has already generated huge interest thanks to the video for her new single 'Womanizer'.

(by Jason Gregory)