So, I have had pretty regular use of this for a while, I call it limited energy manipulation. If I ever feel the need I can typically do a few things; reroute my stamina to a burst of full normal strength for a short time (usually adding to a longer recovery time later than if I just whittled myself down to empty), negate lower levels of pain to being instead weighed against my stamina pool, rapidly regain stamina with a brief uninterrupted focus (seems to work better with more people around), and channel hits to have more impact behind them with less speed/physical effort. I used to do kickboxing and while you could chalk some of it up to conditioning at the time, this has persisted into my life now(10 years later and quite out of shape). There are a few other aspects, but we'll stick with those. Some of it involves creating certain...hmmmm ...marks(?) in my mind to get a full proper effect, but most of it is almost second nature.
So the questions are, it magic? Is it something else? Is it fluff (as people seem to enjoy calling things)? Has anyone had similar occurances?
What you are describing sounds more psychological than magick. Pain reduction is a mundane skill which stems from belief, but requires discipline. Being able to restore stamina sounds like it is either drawing in external energy, or the placebo effect. The marks could just be your imagination running rampant. I have experienced a few of the things you have described. They did not feel particularly magical. I guess it would help to know how magick is defined.
Hopefully this helped.
@feldspar I have considered these things a bit, but when it comes to damage delivered to other people in a fight or practice it's hard not to notice a difference in reactions and recoiling. Most of it can be mental yes, but that also comes down to what one might call magic or just mental. I don't know that I've wrote a specific response to it yet in a post, but they seem to tread closely together if they are not the same thing at times. Spells like those for luck, love, and in some cases curses could easily be attributed to mental effects. A person with a positive outlook on things will generally find themselves more 'fortunate' than those of a negative, not for truly greater fortune but because they focus on those things instead. Confidence that you may garner from a love spell can simply show in your attitude and posture, making one more attractive to their target. Curses, if the target knows you cursed them and they believe or suspect it can as well take effect in them finding things to blame on the curse, solidifying it in their minds and continuing the affirmation on subsequent details, enough paranoia or distraction can lead to having greater mishaps by chance, but to them it could still be attributed to a curse.