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The Wing Chun system allows smaller exponents to easily overcome larger and stronger attackers through its non reliance on physical size or strength. When striking, the Wing Chun exponent strives to relax and maximise the amount of body weight in their strikes, instead of tensing up and holding their weight back. When defending, the Wing Chun exponent relaxes and uses structure, leverage and redirection to overcome their attacker, rather than hard blocking.
By using a double bong sau movement, Len redirects the downward force of the first attacker's stab and then takes him down him with a palm strike and hook kick. When engaging his second attacker, Len shifts his entire bodyweight with a chit sau to the attacker's stabbing arm to deflect the stab. He then follows up with a latch and knee strike to the attacker's solar plexus.
In a real-life attack, your attacker is likely to be larger or stronger than you. No matter what form of self defence you use, if you rely on your own physical strength to defend yourself, a stronger attacker will always be able to strike through your defence. You cannot always rely on being faster than your attacker and landing the first punch or dodging your attacker's strike - particularly when the attack is unexpected.
Wing Chun's non-reliance on brute strength allows the Wing Chun exponent to overcome larger and stronger opponents with relative ease. It also teaches them to maximise their body weight in all movements, which allows the Wing Chun exponent to generate greater striking power than their muscles alone could ever generate.