'When fitness expert and Instagram sensation Kayla Itsines offered to demo some of her best moves for getting washboard abs here at the InStyle offices, the answer was an obvious yes. Enter the weighted straight-leg jack knife. It may be a mouthful, but even just after a rep or two, you fee the burn. Don\'t forget to subscribe to InStyle on YouTube: http://www.youtube.com/subscription_center?add_user=instyledotcom InStyle is the leading fashion, hair, makeup, and celebrity news site. See celebrity and runway photos, how-tos, and learn about the latest trends. For more makeup how to videos: http://bit.ly/1JMq4GH For more fashion inspiration: http://bit.ly/1Nau7zf Website: http://www.instyle.com/ Facebook: https://www.facebook.com/instyle Twitter: https://twitter.com/instyle InStyle Magazine is published by Time Inc.'
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