Is the incline press a lift better suited to developing the punch technique?
NO! The Tunch Punch or open palm strike is utilized for its benefits of short range striking (Wing Chun style). It does not involve shoulder rotation so it is a non-twisting, heel of the hand, horizontal punch. This provides fast, straight, strides and blocks, developed with blunt power. Since it has less distance to travel, the intent of the punch is not telegraphed. Plus, a minimal amount of lower body movement is required for delivery, so balance maintenance and stability will not be disturbed.
