For those readers who are non-fencers or fencers at beginner level, and therefore do not know all the terminology that I used in the recent definitional blog post or its followup, let me illustrate with some Youtube clips.
Simple movement: In this tutorial, several types of movements are explained. At 0:47 in, the movement of the back arm during a lunge is shown – this is a simple movement since only the elbow of the non-weapon arm is moving.
Composite movement: In this tutorial, the lunge is explained. You will see the weapon arm extending – a composite movement since both the elbow and shoulder joints are involved – at about 2:28 in. The leg movements, which also are composite movements involving both hip and knee joints, are shown at about 2:29.
Technique: The whole lunge, shown two times in the time span of 2:27 – 2:43 is a typical example of a technique since it involves several movements, and if executed correctly it will cause the fencer to reach a desired high-level goal – scoring a point in this case.
In the case of the fleche, another technique which has an offensive goal, compare these two clips. Firstly, we see the multiple flechés done in competitions by one fencer, Ruben Limardo, who is exceedingly good at them. That clip shows lots of preparatory fencing movements – at the level of competition that he is fencing, the opposition will not fall for a basic lunge that is based on speed alone. We see that Ruben does a lot of movements immediately before his flechés that are intended as misdirections – they are to cause the opponent to expect something else, react rationally to that false information, and end up in a state such that he is less likely to be able to defend himself from the fleché that follows directly after the misdirection. The second clip here also deals with flechés, but in it they look quite different. These are done in a explanatory context, and done without any preparatory movements. Everything goes slower and the movements are easier to follow precisely because the fencers in the clip made them so for pedagogical reasons.
In the first clip, the movements were difficult to follow since they are designed to fool first-class fencers who are paying attention and know what to look for. In the second, the movements are much easier to follow since they are designed to be understandable to beginners who do not necessarily know what to look for. But it still is the same basic technique.