For some mountain climbers, altitude is everything, which is why so many attempt to climb Cho Oyu every year. Cho Oyu is located on the border between Tibet and Nepal, with an elevation of 8,201 meters. Although it is considered one of the easier of the 8,000-meter peaks, this is not a climb you want to take lightly.

Unlike many of the other mountains you might attempt to climb, the obstacles with Cho Oyu will begin long before you throw on your climbing gear. The requirements of the Chinese authorities have become more stringent over the years, and several permits are required to begin the climb.

Some climbers make it all the way to Tibet, only to discover that they can't climb Cho Oyu at all. Talk about a wasted trip! If you're going to initiate this climb, make sure your paperwork is in order and go through an experienced outfitter with the necessary knowledge to make sure your trek happens.

The other major problem with climbing Cho Oyu is the altitude. Ice, snow and debris aren't as much of a concern as with other mountains, but altitude sickness is common once you've crested 25,000 feet. This is particularly true if you climb in the late fall when the temperatures drop precipitously.

Layers are important to toughing out the differences in temperature from the start of the climb to the finish. For ladies, a lightweight hooded sweatshirt such as the North Face Oso is great to have on underneath your down suit, just in case the sun decides to peak out from behind the clouds. For men, try the Men's North Face SDS 1/4 Zip.

As far as preparation, you'll need to focus on any aerobic activity you can think of. Running stairs, joining a kickboxing class, purchasing aerobic exercises DVDs and whatever you can think of to increase your lung capacity and prepare your body for the assault of climbing Cho Oyu. Since the altitude deprives your muscles of precious oxygen, you can't prepare enough for this trek.

That said, most people who climb Cho Oyu call it a "rush," and claim that very few mountains are as exhilarating. Just don't forget your mother's timeless advice: Drink plenty of fluids.