The earliest known model of a bicycle is found in a manuscript by Leonardo da Vinci in 1490.

But it was only a prototype and no one had made it, it was still only in an imaginary stage.

Generally speaking, what is thought to be the first human bicycle was born in 1791, when the Frenchman Comte de Sivrac was splashed with mud by a carriage one rainy day, and then had the idea to cut the carriage in half along the way.

So that the four wheels became two wheels front and back .

This little carriage has two front and two wooden wheels with a crossbeam attached to the middle, and then a bench was placed on top, so that everyone looked like a toy.

In 1817, a German named Carl Drax also made a two-wheeled cart, adding a handlebar to the front wheel to control the direction of travel.

The advantage of this design was that the handlebar could change the direction of travel.

The problem was that you still had to use both feet to push the bike forward.

In 1840, a Scottish blacksmith called Macmillan upgraded the previous invention of the wooden wheelbarrow.

He put a crank on the axle of the rear wheel, connected the crank to the front stirrup plate with a connecting rod, and replaced the front and rear wheels with iron, the front wheel being larger and the rear wheel smaller.

In this way, the rider could lift his feet up and place them on the pedals, alternating between them to drive the wheels to roll the vehicle forward.

It is recorded that in 1842, Macmillan rode nearly 20 kilometres in one day on his improved version of this vehicle.

What is the principle of the bicycle?

The wheels of a bicycle can be seen as a gyroscope spinning vertically!

So a moving bicycle is harder to fall over than when it's stationary!

When a person rides a bicycle, there is pressure on the ground from the person and the bicycle, and the tyres are not smooth with the ground, so there is friction between the bicycle and the road The wheels of a bicycle can be seen as a gyroscope spinning vertically!

So a moving bike is harder to fall over than when it is stationary!

When a person rides a bicycle, there is pressure on the ground from the person and the bicycle, and there is no smoothness between the tyres and the ground.

So there is friction between the bicycle and the road in the direction opposite to the direction in which the bicycle is moving.

It is these two forces that are equal in magnitude and opposite in direction, so the bicycle does uniform motion.

Regular cycling has many physical benefits, especially when cycling outdoors, where people are mentally focused and can enjoy some of the scenery along the way.

And where riding in a group can be a great way to meet like-minded friends and confidants. These are great ways to relax.

It is also a great way to develop your brain and improve your fitness.

Because cycling is a heterolateral dominant sport, it improves the agility of the nervous system.

Alternating between the two legs allows the left and right side of the brain to develop simultaneously, and cycling is also effective in building muscle strength in the lower limbs and strengthening endurance throughout the body.