Yes, it's true, mt Everest is very dangerous http://www.everestian.com/mt-everest-en.html. First of all, it is important to keep in mind, that excellent health condition and adequate level of mountain climbing skills, plus a strong desire to reach the top of the world’s highest mountain, is a guarantee of successful summit. It is recommended to constantly experience jogging to keep the blood pressure and heart in adequate condition, ready for extreme conditions.