Bethany Hamilton Inspires 'Biggest Loser' Hopefuls

As if The Biggest Loser contestants needed any more motivation in this season of "no excuses," the remaining eight will be paid a special visit from none other than shark-attack survivor and world-renown surfer, Bethany Hamilton.

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Hamilton, who lost her arm at thirteen to a 14-foot tiger shark in 2003, brings her inspirational story to tonight's all-new episode, giving the remaining hopefuls a rousing, fat-burning lesson in the waves.

Watch the clip for a preview of Bethany's appearance on The Biggest Loser airing tonight on NBC.