Cycling also has much to contribute to the wider public health. Getting on your bike can help reduce air and noise pollution and the increasingly alarming problem of urban congestion. However, the fitness and environmental advantages are frequently overshadowed by fears of injury on our often dangerous roads. Cyclists′ concerns are also poorly addressed in current transport policy.
Few interesting facts-
A bicyclist burns about 25 Calories per mile. One large egg supplies 80 Calories. A cyclist can travel about three miles on the energy of one egg.
A person walking would require three eggs to go the same distance.
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A loaded bus requires the equivalent of two dozen eggs for each person it carries three miles.
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A train requires the equivalent of three dozen eggs for each person it carries three miles.
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A car that gets 12.5 miles per gallon requires the equivalent of seven dozen eggs to carry one person three miles.
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Even if you double the miles per gallon and double the occupancy a car will still use the equivalent of twenty-one eggs to make the trip -- more than twenty times a bicycle.
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cycling and walking halve the amount of obesity & heart diesase.Cancer risks are halved by regular exercise. There are about 75 deaths each year from cancer . For every 8 people cycling/walking, 1 case of cancer will be prevented. Thus, if half the population cycled or walked every day, 19 deaths/year would be prevented.
Cycling is a great activity its not best, however, I think jogging/treadmill and swimming are better but that's a personal preference.It will generally improve your fitness, help to burn fat and improve your legs muscle tone. However I would not recommend cycling at a leisurely pace you'll get some fresh air out of it but not alot else.
If you really want good results mix high intensity with low intensity that will really get the heart going.