Empty Stance (Xu Bu): How to Do the Cat Stance Right
In the empty stance (xu bu), often called cat stance, about 90% of your weight sits on the back leg and the front foot touches down only with the ball. The front leg is literally empty, free to kick or step at any moment. Here is the exact position, why your weight keeps sliding forward and how to link the stance with blocks and kicks.
Around 90% on the back leg, the front foot rests only on its ball.
Weight drifts onto the front foot.
In Qi Rise the empty stance is one of the first three stances you learn.
Why the empty stance (xu bu) is different
Xu means empty or unweighted. In the Bow Stance (Gong Bu) you drive your weight forward; in xu bu you sit almost entirely on the back leg and the front leg carries next to nothing. That lets you lift it instantly to kick, step in or slip a sweep.
For your training, it means the back leg does serious work, a lot like a single-leg squat, and you learn precise control over where your weight is. That control carries over to plenty of other techniques, especially kicks that need a rock-solid supporting leg.
Among the basic stances, xu bu is the best teacher of weight shifting. In horse stance your weight is centered, in bow stance it is forward, in empty stance it is back. Practice all three with intent and you quickly feel how balance changes from stance to stance.
How to do the empty stance step by step
- Stand tall with your feet together.
- Turn the back foot out about 45 degrees and bend that knee as if sitting down.
- Shift almost all your weight onto that leg.
- Place the front foot just under a foot length ahead, touching only with the ball, heel raised.
- Keep the front knee slightly bent and pointing forward to cover your centerline.
- Sink so the back thigh gets as close to level as you can manage.
- Back straight, hips under your torso, eyes forward.
Simple test: lift the front foot for a moment. If you do not rock backward or have to rearrange your weight, the split is right.
Cat stance mistakes that sneak in
- Weight drifting forward: the most common one. The stance stops being empty and turns into a short bow stance. Bring your hips back over the rear heel.
- Standing too tall: barely bending the knee makes it easy and trains very little. Sit lower, even when it burns.
- Front heel down: the front leg automatically starts carrying weight.
- Back knee caving in: it should follow the toes of the back foot.
- Leaning back: many tilt the torso back to keep the weight there. Lower your hips and stay upright instead.
Blocks and kicks from the empty stance
Xu bu is the stance for quick reactions, and two techniques from the curriculum show it well. In the High Block (Liang Zhang) one hand turns outward above the forehead, elbow slightly bent, head turning to the side, all in empty stance. The usual flaw is leaving the arm in front of the face instead of taking it above the forehead. The Outward Forearm Block in Empty Stance opens the forearm outward in front of the chest while the weight stays back.
Because the front leg is free, the stance is also a great launch pad for a fast kick. Try it: stand in xu bu, lift the front knee, snap the lower leg out, pull it back and land on the ball again. For more kicking drills, see learn kung fu kicks.
The empty stance comes back later in the animal forms, for example with the crane beak in the Crane Combination and the finger thrust from empty stance in the Snake Combination.
An empty stance practice plan
Warm up for 5 minutes and practice three or four times a week. The empty stance is tougher than it looks because nearly everything rests on one leg.
- Hold: 3 × 20 seconds per side, building to 30 seconds in weeks 3 and 4.
- Foot-lift test: lift the front foot 10 times without wobbling.
- Switch from horse stance: from Horse Stance (Ma Bu), shift onto one leg and draw the other foot into xu bu, 2 × 8 per side.
- Xu bu with high block: 2 × 8 per side, slow.
If the back knee hurts, stand higher or stop. A burning thigh is normal, sharp joint pain is not.
FAQ
How much weight goes on the back leg in empty stance?
About 90%. The front foot touches with the ball only and carries almost nothing. You should be able to lift it at any moment without losing balance.
Is the empty stance the same as the cat stance?
Yes, cat stance is the common English name for the same idea: weight back, front foot light. Depth and foot distance vary a bit between styles, but the principle is identical.
Why does my back leg burn so much in xu bu?
It is holding almost your entire bodyweight in a bent position. That is the point, and it builds your quads and glutes. Short sets with breaks work better than one long hold when you start.
What is the empty stance used for in kung fu?
Fast reactions: evading, blocking and instant kicks with the front leg. Many forms use it as a transition between attacks, and it sharpens your balance and weight control.
Which leg goes forward in cat stance?
You train both sides so neither one falls behind. In forms, the side depends on the movement before it. Feel free to give your weaker side an extra set.
Listen to your body: warm up first and stop if anything hurts. Qi Rise is for ages 16 and up.