There're a lot of related concepts floating around in here, including safety and responsibility issues, in addition to what I'd call the central issue of 1) allowing commitment to the turn/hill/jump/etc., without 2) getting so tensed it's counterproductive. As used in terms of maintaining optimal levels of arousal without fear entering in too much, I personally would prefer terms like uninhibited and rewarded to describe what's going on, as depending on personality feelings of aggression may or may not produce that state.
Someone used the boxing analogy earlier in the thread. Bernard Hopkins I'd say has a definite, ummm, aggressive
: thread to his personality, Oscar De la Hoya does not, both are very relaxed and very physical at the same time.
In skiing or riding terms, you have some men who often relate making turns to issues of self-esteem and perceived social dominance, and need to learn to relax, let the turn work for them, not lie about their ability (at least to themselves) and in general not act like they're in the office. So you're trying to shape more relaxed activity, say rewarding them each time they demonstrate more absorption & extension in the bumps. (Look at MA threads, I'm amazed how little absorption even very good skiers deomstrate on here; people seem to view zipperline as simply pounding the bumps like a bull in a china shop). You have some people who are gun-shy because of the way they were initially introduced to skiing or riding, who need to have the fear response extinguished and among other things have pressuring the shovel/committing downhill rewarded each time it happens. Aggressive feelings can often in my experience work to maintain a fear response, so it may not be the best metaphor for the gun-shy. (Interestingly, people who are aggressive physically in some contexts can be quite gun-shy in others, witness people who've had bad early experiences with water trying to learn to swim as adults, or ex-football players who began playing golf on an outing with their boss.) Some women are highly motivated by concepts of grace and beauty, and will do very very bold things that they view as embodying these things (witness the balance beam in gymnastics, women on rails in the park) but are turned off by things that lack those concepts. My daughter responded well to the metaphor of an eagle swooping on talons, but not to the grrrr/gorilla thing.
So, I think you need to shape different things in different people to produce sound technical skills and arousal/relaxation levels, and realize that appropriate reinforcers for shaping will also differ.
Standard disclaimer: I don't teach, yada yada.