Simone De La Rue is one of the foremost experts in fitness, having helped shape celebrity bodies like Sandra Bullock's and Anne Hathaway's, and even developing Body By Simone, her very own training program.
On second thought, do we really need to list Simone's qualifications as a fitness expert? Just look at her. The woman couldn't be more physically fit.
With that in mind, we can think of no one we'd rather ask for advice on our cardio routines. Check out the video above to watch Simone demonstrate four of her favorite calorie-burning exercises, and we're sure you'll agree.