The early aughts were full of great celebrity couples — Brad and Jen, Britney and Justin, Ben and Jen (Part 1) — but sometimes we’re just as fascinated by those who flew a little more under the radar.

It’s totally normal for kids to pick up traits from their parents. And not just their looks—I'm talking little mannerisms, quirks and sometimes, full-on performance energy. Case in point? Jessica Biel ...

Jessica Biel, known for her role in "The Better Sister," recently shared a much-requested glimpse into her upper-body fitness routine. With her trainer Ben Bruno , she demonstrates targeted exercises.