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Zorbing -LRB- globe-riding , sphereing , orbing -RRB- is the recreation or sport of rolling downhill inside 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 .. Due to the buoyant nature of the orbs , Zorbing can also be carried out on water , provided the orb is inflated properly and sealed once the rider is inside .. `` Water walking '' using such orbs has become popular in theme parks across the UK .. 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 and Andrew Akers .. Rotorua. Rotorua. New Zealand. New Zealand