Karate: Down Block
In karate, the downward block, known as gedan barai (下段払い), is a fundamental defensive technique designed to deflect or sweep away attacks aimed at the lower part of the body, such as kicks or strikes directed toward the abdomen or groin.
Execution of Gedan Barai:
Preparation:
- Begin in a natural stance (shizentai), with feet approximately shoulder-width apart and arms relaxed at your sides. 
- Bring your blocking arm across your body to the opposite shoulder, forming a preparatory position. Simultaneously, position your other arm at your side, ready for the hikite (pulling hand) motion. 
Blocking Motion:
- Execute a downward sweeping motion with the blocking arm, moving from the opposite shoulder down to the outside of the thigh on the same side.
- As you perform the block, rotate your forearm so that the palm faces downward at the end of the movement.
- Ensure that the blocking arm is slightly bent upon completion, with the fist positioned a few inches in front of the thigh. 
Hikite (Pulling Hand):
- While the blocking arm performs the downward sweep, pull the opposite arm back to the side of your waist, palm facing upward. This simultaneous action enhances the effectiveness and power of the block.
Key Points to Consider:
- Body Coordination: Coordinate the movement of your arms with the rotation of your hips and torso to generate maximum power and stability.
- Breathing: Exhale sharply as you execute the block to engage your core muscles and enhance the force of the technique. 
- Relaxation and Tension: Maintain a relaxed state during the preparatory phase and tense your muscles upon the completion of the block to ensure both speed and strength.