Quote Originally Posted by Von Milash
So, I have to chime in and say that yes, training at altitudes does benefit you. With less oxygen, your body adapts.

Also, there is an effect on performance. Look at Coors Field in Denver, CO. Baseballs fly out of that park like no other.

Why do you suppose planes fly at 30,000ft? It aint for the scenery.
To be more economic with fuel maybe?

The scientific data for optimum altitude training is fairly sparse. Probably due to the fact that the adaptations are subjective and genetics has a role to play. Doesn't mean that it doesn't work though.