Jury still out on best cardio machine

In the battle of the cardio machines, the treadmill reigns supreme, but the elliptical cross trainer could be a contender.

Experts say treadmills give your workout the extra oomph of a motor, while ellipticals promise a smoother ride, and both have their champions.

"Both have advantages and disadvantages," says Dr Henry Williford of the American College of Sports Medicine (ACSM). "Treadmills are more stimulating for running, while ellipticals are non-impact, if you don't want to jar."