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Fans of Jessica Biel’s sculpted body might want to listen to the man behind her biceps: personal trainer Jason Walsh.

In an interview with usmagazine.com, Walsh dished that Biel’s workouts incorporate full-body movements that use multiple muscles at once to jack up her heart rate.

Walsh also suggested eating snacks that provide sustained energy — “really organic and clean foods, all natural, like nuts,” and “an amino acid drink, so that you’re not burning up a lot of your muscle, or protein.”

Ha! Watch out, Biel. You’re in for some competition. … So, uh, Diet Coke counts as an amino acid drink, right?