Hiza No Nuki means to drop all power from the knee. Actually it is the technical method to use Tobokuho to facilitate correct movement.
The objective of Hiza No Nuki is to bend the knee(s), move smoothly using the gravity, moving the whole body forward. Hence, relax the knee(s) instantly. Take care, bending caused by bending is a common error, you should bend by unblocking.
Ultimately, this should be done naturally.
If you bend because of bending you will tend to support the body with the upper leg muscles. It is the upper leg muscles that together with the knee need to be shut down temporarily to let your body drop drastically or allow your body to move smoothly.
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Strictly speaking, in Budo it is not necessary (and not advised) to always move at maximum speed as is often seen in tournaments. More fundamentally though, you need to be able to move slow, smooth and fast without any excuse of why you don't need this or are not able to. Going from one stage into the other comes down to accelerating your movement. Your knee has a tremendous part to play in this and it this video I will teach you how to use that to your advantage.
Awareness first. Feeling your knee. Then control - learn to turn your knee 'on and off' with specific exercises. These videos are from my seminar on Hiza No Nuki where I introduced key methods. Methods that I learned from Nukina sensei. It all starts here...
If there's one thing you want to avoid it's "Isolated Knowlegde". That's what Yokoyama Kancho called knowledge that only exists in certain situations and is not holistic. Make your knowledge holistic so you can apply it in any situation and benefit from that skill each and every time.
When it comes to Gyakuzuki, everbody thinks about the hip. And nobody about the knee. It makes sense as the primary source of power is the hip.
Having said that, to utilise the power generated your knee a shoulder have to play along as well. Use this method to discover how you can improve Hiza No Nuki with Gyakuzuki.