On 11/07/2015 23:26, Judith wrote:
On Sat, 11 Jul 2015 07:11:20 +0100, Bod wrote:

"People who cycle regularly in mid-adulthood typically enjoy a level of
fitness equivalent to someone 10 years younger and their life expectancy
is two years above the average.

On the other hand

For men, the health benefits of bicycling may involve a troublesome trade-off.
While riding a bicycle burns calories and improves cardiovascular fitness, too
many hours on a bicycle saddle can compress the artery and vital nerves leading
to the penis.

The result? A risk of numbness, pain, and erectile dysfunction.

A male cyclist can place a significant percentage of his weight on his
perineum, an area between the scrotum and the anus where the nerves and
arteries to the penis pass. This pressure -- and a narrow saddle seat -- can
injure the arteries and nerves.

"The earliest warning sign is numbness or tingling," says Irwin Goldstein, MD,
director of San Diego Sexual Medicine.

Even a young man may lose the ability to achieve an erection, says Goldstein

Darwinism in action.