How to do a perfect plank: ‘Biggest Loser’ trainer Dolvett Quince shows how

As TODAY’s special series One Small Thing continues to focus on simple, smart ways to improve your everyday life, Dolvett Quince, one of the trainers on “The Biggest Loser,” shows Natalie Morales (and you) how to do a perfect plank. TODAY fans on the plaza join in the fun for Tone-Up Tuesday.

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