It is well-known that going to work by bicycle is good for the glucose and cholesterol levels, stress reduction, good mood and productivity increment. Indeed, according to the Dutch Ministry of Infrastructures 80% of workers who pedal to work show a better compromise between companies and their jobs, and their work absenteeism diminishes. Moreover, diabetes is reduced by 20%. Not surprisingly, open-minded governments promote the use of bicycles with strategies such as giving social benefits to workers who buy bikes through firms (these get tax reductions), those workers who ride to the office obtain money per pedaled kilometer, urban biking promotion not only the Day of the Bike but 365 days in a year, a day for bike maintenance, free subscription to public bikes, bike lines and bicycle parking building. In return, sanitary costs are reduced and environment improves not only because bikes do not pollute in the using stage, but also as a result of if a person uses a bike instead of a car she provokes the same emissions diminishing as one tree every month.