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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.