... zorb,zorb ball. zorbing.Zorbing (globe-riding, sphereing, orbing) is the recreation of rolling downhill in an orb, generally made of ... done on a level surface, permitting more rider control. In the absence of hills some operators have constructed inflatable, wooden or ... non-harnessed. Non-harness orbs carry up to three riders, while the harness orbs are constructed for one to two riders. Double ...