I take my bokuto with my left hand, having it closer to the blade and the right hand farther away from it, and place it high in the air above my right shoulder, pretty much my left risk parallel to my right ear. The face of the sword is facing down. Then, in a single fluid motion, I step with my left foot to gain power as I swing downwards in a vertical motion. Thanks to gravity and the force exerted the velocity of the sword increases dramatically, connecting on the dummy in no time. The dummy is hit in collar bone in the right shoulder. The force exerted makes the dummy fall from position.
Once more, marvelously done. ^_^
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.