Position of the Arm. If the blocking arm ends in a position that is too far from the body, greater range is achieved but with a loss in power. If the arm ends too close to the body, the attack may not be stopped in time but the block has more power. In the ideal position, effective range and power are achieved. For example, with an inner forearm block, if the block ends with the forearm vertical, the block has move coverage and may hit with more power, but it may not stop a punch before it strikes its target. If the block ends with the forearm too extended, it has a longer reach but its coverage is smaller and it has less power. The ideal forearm ending position is extended at a 45-degree angle for good coverage, good range, and good power.
End of the Block. Blocks should terminate when the attack is stopped or deflected enough to prevent impact. Do not over block by moving the arm past its most effective point, it opens you up for another attack and closes you up for making a counter attack. For example, with an inner forearms block, if the block moves too far across in front of your body, it exposes you to an attack behind the block and it prevents you using the trailing arm or a counterattack.
Immovable Elbow. Lead elbow should be about a fist’s distance in front of the lead side ribs at all times. Never allow it to rest against the body or move out to the side of the body. When elbow is against the body, it makes it easier for your opponent to trap your lead arm. If the elbow is out to the side, the lead side ribs are exposed and it is difficult to protect the centerline. If the elbow is leading the body, it is easier to deliver a non-telegraphic strike with the lead hand. When elbow is kept in close, it only requires slight movements of the elbow or slight twists of the body to deflect or block attacks.