A bicycle also called a bike or cycle, is a human-powered or motor-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A bicycle rider is called a cyclist, or bicyclist. Source Wikipedia
Keeping fit physically is saving smartly. Yes, I say it is saving smartly. Getting involved in regular physical activities like riding a bike can help protect you from serious diseases such as stroke, heart attack, depression, obesity, arthritis and diabetes. Riding a bike is healthy for all ages.
In our ever-growing cities, riding a bike comes very handy. It makes movement from one place to another easier. A city that uses bikes more is cleaner and safer. Emission of toxins to the environment is brought to minimal.