If you live in a double storey house or apartment, stairs exist to be ridden. The most experienced riders recommend you to place fluffy pillows in the finishing section of each ride, so that you don't end up painting your walls blood red.
Swim fins are in constant friction with your feet's skin and may cause friction rubs and blisters in some areas of your feet.
Carlos The Handboarder is a bodyboarder with multiple skills. In Habitat a static river wave in Montreal, Canada, there's a man bodyboarding, kneeboarding, bodysurfing and handboarding in the same ride.