That really depends on what style of climbing you are doing.
For trad, sport, aid, and ice you will need a harness, rope, carabiners, helmet, protection (specialized gear like quickdraws or cams), and some specialized shoe for the style.
For bouldering you need shoes and a crashpad.
For deepwater you just need shoes (maybe).
Chalk is also nice.
don't just go buy gear and try it out though. Go with someone who knows what their doing, learn the sport, and use their gear for a bit.
good rock climbing shoes, a harness, and a helmet.
Rock climbing is not very dangerous if you know what you're doing and have the right equipment.
You can sell used rock climbing equipment online at eBay where people will bid on the item and pay you usually through an online service such as PayPal. You can also post a listing of the equipment on Craigslist along with your contact information and people will get a hold of you to purchase your items.
Due to the dangerous nature of rock climbing there are several pieces of equipment that are essential. The first piece of equipment would be climbing shoes followed by a quality harness and rope. The type of climbing being done will dictate any other specialized pieces of gear.
UIAA sets safety standards for rock climbing equipment and set a international standard for grades (difficulty ratings for individual routes).
It will obviously depend on your location. However, one chain, REI, is prevalent throughout the United States. They sell rock-climbing equipment and are generally known for their knowledgeable staff.
A huge amount of engineering and developing goes into every piece of rock climbing equipment. Most of it has to do with the natural science of gravity and just what kind of forces they need to protect your body from if you fall.
You need a harness to go rock climbing and if you fall off the wall this will prevent you from hurting yourself. It is also advisable to have a trained professional around to assist you.
Probably not. She was probably dropped off by a helicopter.
Most climbing slang has to do with certain commands between partners. For example a climber may say to the person belaying 'take' when they want all the slack taken out of the rope so they can rest, or come down off the wall. Other slang is used to describe the equipment being used.
You can check the History of rock climbing in Wikipedia.
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