In climbing, what is a hand jam?
Hand jamming is a technique used in crack climbing used to support the climbers upper body. The climber places their hand in a crack, then flexes their thumb towards the palm to expand their hand, creating friction between the sides of the crack and the base of the thumb and back of the hand. There are many variations on the technique depending on the size of the climber, the size of the crack, and the circumstances of the route.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------

----------------
Answer the following query.
In climbing, what is a hand jam?

user
Hand jamming is a technique used in crack climbing used to support the climbers upper body. The climber places their hand in a crack, then flexes their thumb towards the palm to expand their hand, creating friction between the sides of the crack and the base of the thumb and back of the hand. There are many variations on the technique depending on the size of the climber, the size of the crack, and the circumstances of the route.
assistant