Chi sau can be done hard, physically or soft. Each requires different skill sets and muscle use. A key factor required in all is the ability to penetrate into your partner. This is a bone penetrating movement and is especially important when your opponent is physically larger than you. To get the penetration your body has to move like a spring discharging a load, your body has to move in to the opponent and you have to align the penetrating part with the centerline of your body so you penetrate from your center.
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