a) proper alignments:
| 2) | depth - striking arm extended to depth of about half Invisible Box |
| 1) | hand - knuckles upward, palm forward, middle knuckles diagonally downward |
| 2) | wrist kept straight (not bent up / down and / or side-to-side) |
| 3) | elbow directly inline below fist (angled diagonally forward) |
| 5) | upper body / hips - Twist rotation |
| 6) | legs / feet - Twist rotation |
| iii) | Point of Contact - index / middle / ring finger middle-knuckles (avoid pinky knuckle) |
| iv) | stance - Twist positioning |
b) proper formation - weapon (hand):
| i) | fingers - standard fist (tightly bent and kept together to form Compact Unit) |
| 1) | wrapped under bent fingers (Compact Unit) |
| 2) | do not allow to separate from contact with fingers |
c) execution:
| i) | Method of Execution - Hammering |
| 1) | improper speeds / methods: |
| A) | executed too slow (transforms into push with knuckles) |
| B) | executed too fast (stance change unable to keep up with strike) |
| C) | executed too tense (unable to achieve proper 'snap' of strike) (strike looks 'pushed' out) |
| D) | strike not tensed at Point of Contact (improper timing / never tensed) |
| 2) | improper alignments / angles: |
| A) | elbow not anchored (aka no "chicken winging") |
Form Specific
a) execution errors:
| i) | not executed with proper strike (middle knuckles) |
Comments
a) Common alignment errors:
| i) | arm extended too far forward (over reaching) |
| ii) | elbow not anchored properly (not inline with knuckles) |
b) Common execution errors:
| i) | strike executed on arch not line |
Example of a proper half-knuckle (left)
(with instep kick)
Example of proper helf-knuckle formation
Examples of improper half-knuckle -
weapon formation / alignment
wrist bent, fist not closed properly,
thumb tucked
Examples of improper half-knuckle execution
depth - shallow / deep, improper height - high / low,
width - wide, elbow not anchored