(Cover) - EN Showbiz - Jessica Biel has revealed her secrets to having one of the best bodies in Hollywood.

The 30-year-old actress is gearing up to marry Justin Timberlake following their engagement over the holidays.

And she told InStyle how she keeps her enviable physique in such great shape.

"Some days I'll sprint on the treadmill; other days I'll hike with the dogs. I also fit in yoga classes and some swimming," she revealed.

"My trainer, Jason Walsh, works with athletes, so we do a lot of football drills, like pulling big sleds and waving heavy ropes. It's intense cardiovascular training but really fun."

And when it comes to her diet, Jessica swears by eating "clean."

"When I'm working, I try to keep my diet really clean," she revealed. "Loads of vegetables, lots of quinoa and grain protein and some occasional animal protein."

"I also drink green tea, and I slip in veggies like beets and zucchini into cakes and fudge."

Jessica recently revealed that Justin was the one to pick out her engagement ring and she had nothing to do with it because she doesn't "micromanage." (C) Cover Media