A bicycle is a two-wheeled vehicle propelled by pedals and steered with handlebars. It is the most common means of transport in many regions, and can be used for recreation or fitness. The basic shape and configuration of the bicycle has changed little since its inception, but it has spawned many specialized designs for different purposes. Bicycles are used in military and police applications, courier services, recreational riding, bicycle racing, and artistic cycling.

The bicycle’s success in the early 19th century is usually attributed to its capacity to provide a new source of energy for work and play, to replace horse-drawn vehicles, and to facilitate modernization of rural areas. It also brought a more level playing field to men of the working classes, as they no longer had to rely on their wealth and social status to enjoy outdoor activities.

A bike can convert up to 90 percent of the energy from its rider into kinetic energy, or motion. This energy is transferred from the pedals to the wheels via a chain. The bike’s mass and balance determine how much momentum it has, or how fast it will move.

To start riding a bicycle, the rider rests one foot on the pedal of the right-hand side and pushes the other pedal to propel the bike forward. The bicycle should be balanced with the rider’s weight distributed evenly. Once the rider is comfortable, he or she can remove the support from the left leg and pedal with both feet to gain speed.

When attempting to climb a rock wall on a bicycle, riders should be careful to lock their knees and keep their core tightly engaged. This will allow them to maintain control of the bicycle and reach holds that would otherwise be inaccessible. This technique also helps to avoid slipping off of the bicycle when reaching for difficult holds.

Cycling is a great exercise for building strength, endurance, and aerobic fitness. It is a low-impact activity that can be done at a variety of intensities, from a light workout to a full-body challenge. In addition, it is accessible for most people and does not require a lot of expensive equipment. It’s also fun, which makes it more likely to be maintained as a long-term activity than other physical exercises that are boring or require specialised equipment or gym facilities.