A little bit about Roller Skating

Roller skating is the traveling on surfaces with roller skates. It is a form of recreational activity as well as a sport, and can also be a form of transportation.
Roller skates are devices worn on the feet to enable the wearer to roll along on wheels. The first roller skate was effectively an ice skate with wheels where the blade goes.

History:

The first patented roller skate was introduced in 1760 by Belgian inventor John Joseph Merlin.
Eventually, roller skating evolved from just a pastime to a competitive sport; speed skating, racing on skates, and figure skating, very similar to what you see in the Olympics on ice.
Rest of the 19th century: inventors continued to work on improving skate design.

An advert for an early 20th model which fit over ordinary shoes