Very good.Sorry for the late reply, it didn't come up on my subscription and I just noticed it...
I grab my katana with both hands and stand in a position with both arms little higher waist high and with the katana pointed up with a 45 degree angle. Then I swing both arms up and over my head, thus the katana would be facing behind me. With my back a little arched I quickly burst forward and swing both arms forward, down motion with the katana swinging forward straight down as well. To add more strength I also use a little of my back as I lurch forward to add momentum. As I slash down my bands also go forward thus making the katana blade be parallel to the ground and at the end of the slash the katana will point to the ground in a 45 degree angle and my hands will be a little below my waist, with my back a little arched forward...
Now, we'll move on to something quite a bit different: lunges.
You can consider a lunge an advanced stab. Lunges have not only a lot more power behind them, but a greater range, due to the fact that you're leaning your body in to strike. Lunges are excellent combo finishers, or if you gather enough skill, combo openers.
They share a similar weakness in that if deflected, they leave you relatively open. However, like stabs, they can be recovered from fairly quickly if done correctly.
Lunges involve stepping forward while thrusting your blade forward as well, generally with you leaning forward in addition; lunges will be done primarily with one hand due to their form, though they can be preformed with two-hands: however, doing a lunge with two hands alters the form quite a bit.
Here's a video of lunging in modern sport fencing:
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.Note that since this is battle training, and what the lady has preformed was a sport maneuver, we have a few differences: instead of flaring your arm out behind you, it will most likely be at a side-diagonal, in order for you to keep it in place for use; as well, you may lean past your ankles occasionally - though this weakens your stance, thus making it harder to recover from the stab quickly, it adds a bit more range to it.
Now, if you would, please preform a lunge, in detail.