There are cases of people who can do such to some extent. I am one of those people.
Basically, the mitochondria in your body only produce 1/1000th of what they could.
In some cases it is abit higher, but generally no more than 1.5/1000th(or 1/750th)
This is nessessary for the body to have such a limitations. Because it not being limited could stunt growth, cause insomnia, among other problems...
Possibly why my boyfriend stands a foot over me when he's only 6'1. >_<
Anyways, lowering the limit to 1/500th would OBVIOUSLY have an extensive effect. Effectively doubling your "stamina" so to speak.
So while you may feel like "Dood...Am I haxing with mana?" you might infact just be lowering the limit on your mitochondria.
From what I've heard there are people who can go as low as 1/100ths. I myself would only estimate going to somewhere near 1/400th.
In my case, it is a Conscience decision. Though I probably started with an already lower than average amount(probably 1/900ths, same as quite a few people).
In your case, your body may recognize how to do so subconsciously.
Find your trigger. That's your key. You're not gonna BEEF UP or anything, but it should generally give you faster reflexs, more stamina/energy, etc.
In theory, having a VERY LOW fraction would border on magic h4x.
Basically, in theory, having about 1/5th of your maximum mitochondrian output could give you a natural static charge or extensive heat.
I wouldn't attempt such, because the same theory states that it could be fatal to the body. You could literally zap your heart or brain to death, or turn into a GREAT BALL OF FIRE! *Dances*
But yeah. Just a thought. That COULD be what you're feeling as "Mana".
Find. The. Trigger.
Mine is simple. Move it. Imagine it unlocking. It unlocks slightly. The key is placed in the lock, it is turned. That lock becomes unlocked. The key is placed at the next lock, repeat. Well that's how I used to do it, one lock at a time. Now I just imagine unlocking a large amount at once.
I doubt I've unlocked more than 1/300th or so. Hell, at 1/400th I start to black-out.
inb4howdoudoit: How do you move your thumb? Yes, your body sends a command that says "move" and your thumb moves. But how do YOU move it? What conscious trigger gives you the ability to move your "Thumb" or "Shoulder" or "Left Buttcheek"?