high altitude 
did you know that the burj khalifa is technically not high altitude
olympic athletes train there for the extra red blood cells
here are some of the athletes who train at high altitudes
Emma Coburn
Jenny Simpson
Galen Rupp
what happens to your body at high altitudes
as a olympic runner you need all the advantages you can get and one of the biggest is having lots of red blood cells
as olympic train high altitudes there body acquire more red blood cells which allows their blood to carry more oxygen.
there is a force that holds you back it is created by the wind and training at higher altitudes can strengthen that force so it will give you a obstacle to overcome
scientist have concluded that if usain bolt trains at higher altitudes he will be able to break his record
high altitude is defined as
High altitude is sometimes defined to begin at 2,400 meters (8,000 ft)
high altitude places
Lhasa
Windhoek
Cusco
how it affects the respiratory system
the reduced oxygen content of the blood induces breathing
periods of deep and rapid breathing alternating with central apnea This breathing pattern is called high-altitude periodic breathing
It occurs even in healthy persons at altitudes above 6000 ft.