Since elliptical machines first came onto the scene, there popularity has grown more than
any other piece of cardio equipment, according to the American Council on Exercise.
With that said, you could use
any other piece of cardio equipment providing you can do those intervals of high intensity followed by recovery at a lower intensity.
Not exact matches
But because the site didn't have enough space, they had stripped out all the extras in their
other gyms, like juice bars and daycare and group fitness classes, and had a hundred
pieces of cardio equipment or so and that's about it.