The practice of humans traveling in a sphere, generally made of transparent plastic, usually for fun
Well with sphereing, you are that sock - a prisoner inside a huge inflatable spherical jail, travelling down hills at speeds of up to 30mph.
Zorbing (globe-riding, sphereing, orbing) is the recreation of rolling downhill in an orb, generally made of transparent plastic. Zorbing is generally performed on a gentle slope, but can also be done on a level surface, permitting more rider control. In the absence of hills some operators have constructed inflatable, wooden or metal ramps. There are two types of orbs, harnessed and non-harnessed. Non-harness orbs carry up to three riders, while the harness orbs are constructed for one to two riders. Double-harness spheres have different slope requirements, and must only be operated in specific locations. The longer runs are approximately half a mile. The first zorbing site was established in Rotorua, New Zealand, by David Akers and Andrew Akers