Whether it be a cloth, a wheel or rope... is there any prop you want used?
My fave of the ones they used so far on both seasons was the chair by Siddesh/Jai.
This probably sounds really weird, but I want them to use a treadmill, so much can be done. They can run on it, slide through the arm supports, do balancing stunts, they can put it in an upright position and hang off it...... hahaa what I say right now probably doesnt make any sense but if you look at a treadmill it will :P