A block is a technique used against an attacking weapon, such as an arm, leg, stick, etc, to deflect or stop the attack. A basic tenet of the martial arts is "no first strike." Martial arts are concerned about defense first and then about offense; therefore, blocks are of primary concern to martial artists.
About blocks: Basic information about blocks.
Physics of blocks: Effects of linear and angular velocity on blocking.
Blocking effectiveness: Factors that affect the effectiveness of blocks.
Guard: Keep your guard up!
Types of blocking: The different ways you can block.
Blocking techniques: Descriptions of some blocking techniques.
Jamming: Stopping an attack before it can be fired.
Single versus double bone blocks: Which is the best way to block?
Block and counterattack: A counterattack should always follow a block.