Sloth
Becoming a sloth requires being born as one, which presents certain insurmountable barriers for the majority of interested parties. Current estimates suggest there are approximately 6 million sloths in existence, representing the entirety of participants in the sloth lifestyle.
For humans wishing to observe sloth existence, travel to Central or South American rainforests becomes necessary - a journey the British Ecotourism Board describes as 'considerably more effort than any sloth would ever approve of.' The irony of travelling extensively to observe creatures that barely move has not been lost on researchers.
Surfing
Surfing theoretically becomes available to anyone with access to waves, a board, and a concerning disregard for comfort. The sport exists along coastlines worldwide, with an estimated 35 million regular participants globally. Entry requirements include the ability to swim, willingness to wear neoprene, and tolerance for sand in uncomfortable places.
Equipment costs range from modest to astronomical, though the ocean itself remains free of charge. The International Surf Access Foundation notes that approximately 70% of the world's population lives within 100 kilometres of a coastline, making waves theoretically accessible to billions.
VERDICT
Whilst both pursuits have geographical limitations, surfing permits human participation, whereas becoming a sloth remains biologically exclusive to actual sloths. A significant advantage for the sport.