There are many movements in roller skating design, and it needs repeated practice, which requires higher requirements for knee and ankle joints. If you skate for a long time, you may have X-legs or O-legs.
Introduction to roller skating:
1 100 The earliest skates were games that used the bones of the soles of boots to help hunters hunt in winter. The first pair of skates was invented by Scots and Dutch in AD 1700.
He wanted to simulate skating in winter in summer, so he tied a nail-tapping spool to his shoes. This year, the first skating club was established in Edinburgh.
The first roller skates appeared in A.D. 1760, and Joseph Merlin, a London musical instrument manufacturer (probably the first person to really invent roller skates) decided to make metal boots with wheels. One day he attended a masquerade party, and he slipped in from the entrance to play the violin.
However, before he knew how to brake and control shoes with wheels, he ran into a mirror worth 500 pounds. At that time, the mirror was more expensive than gold. He was dizzy and cut badly. It didn't matter if the violin was destroyed. The problem is that he can't afford a mirror.
He finished skating in front of a huge mirror. Until the end of the dance, he didn't learn to brake and turn. Indeed, the skill of roller skates is not how to start, but how to stop.
18 19, in a French invention patent, M.Peitibled recorded the first pair of roller skates (each foot has 2~3 wheels in a row), but it did not reach the expected "popularization" and finally got nothing. 1823 In London, Robert John designed the roller skates "Rolito" with five wheels on each foot. Rolito "was not taken seriously at that time.
1863, American James invented the first pair of roller skates. The four wheels are divided into front and rear groups, and the two wheels are worn by two shafts.
The bearings on the four wheels can make the wheels rotate stably, and can do various actions such as turning, advancing and retreating. This is the most widely used roller skating now, and it has become the sports equipment for roller skating, figure skating, jam skating and extreme roller skating, and it is also the exclusive sports equipment for jam skating and figure skating!