JKD Biomechanics LLC
JKD Straight Lead
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The foundation of the JKD Attack
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The
JKD Straight Lead appears to have "evolved" from the Wing Chun Straight Punch, the Boxing Jab, and the Fencing Lunge.
Lee incorporated and refined biomechanical principles during the evolution process to maximize the force at impact. The
JKD Straight Lead is considered the most efficient (and devastating) Simple Direct Attack in the JKD arsenal.  The 4 Biomechanical "Phases" of the JKD Straight Lead The 4 Biomechanical Phases are; 1. Prepartory Phase, 2. Movement Initiation Phase, 3. Impact Phase,
and 4. Terminal (Recovery) Phase. The term phase describes a motion as
a sequence of "events" (specific/discrete movements) and provides a "structure" to gain insight into the
characteristics, the underlying processes of [neural] organization, and the biomechanical goal(s) of the movement. Bruce
Lee broke JKD techniques into "phases" and often used this term in his own writings. The
main biomechanical goal of the JKD Straight Lead is to produce force and "project" that force to
an external object (the opponent). The momentum of the fist, through momentum-impulse transfer (derived from multiple body
segments), translates into high impact force at the point of impact. One of the best descriptions of the JKD Straight Lead was given by Sifu Ted Wong, who described it
as "the Fencing lunge without a sword", and also as a "three point landing" (referring
to the proper timing/sequence of the fist/front foot/rear foot). The timing of the "three point landing"
facillitates the transfer of momentum, ground reaction forces, and maximum impact force to the punch. |
The transfer of impulse-momentum is the primary
biomechanical principle incorporated in the JKD Straight Lead.