Cycling is a recreational activity or sport, as well as ground transportation is one that uses a bicycle. Many cycling enthusiasts who perform these activities in various fields, such as hills, steep terrain and also just a race for speed only.
Professional cycling sport called cycling.

People who use bicycles as transportation can also be called a commuter routine. The use of bicycles as transportation is not routinely performed only by workers who work in non-formal sector, but also performed by workers employed in the formal sector.

Cycling and Mood (spirit)

Cycling provides a positive effect on feelings and our mood. Cycling can reduce depression, strees, improve mood and motivate ourselves. As an example we can see with the cycling environment more closely, socializing with the environment, enjoy the scenery and fresh air. Bonus of all is health.

Cycling and Air Pollution

If you do not have to worry about air pollution caused by vehicle traffic, the study says people who bicycle less affected by air pollution from the people who ride in motor vehicles. This is possible because people in the bike breathe more regularly and inhale more oxygen.

ref [from various sources]