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Watch Justin Timberlake and Jessica Biel's Plank Workout

My Abs Are Sore Just Watching Justin Timberlake and Jessica Biel Crush This Plank Series

WEST HOLLYWOOD, CALIFORNIA - FEBRUARY 03: (L-R) Justin Timberlake and Jessica Biel pose for portrait at the Premiere of USA Network's

Image Source: Getty / Rodin Eckenroth

Justin Timberlake and Jessica Biel certainly make ab work look easy, but we know how challenging a plank series can be. Ahead of the new year on Wednesday, the duo shared quite the impressive core workout on Instagram, and yep, my abs are sore from just watching. In the video, the two demonstrated a series of plank reaches, hip dips, shoulder taps, and side plank exercises, all while holding solid planks.

As they moved through each rep, the pair were perfectly in sync with not only each other but also the inspiring — yet admittedly intimidating — training music. Watch the two power through their workout with ease ahead.

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