what does building energy do?
ive been meditating for twenty minutes a day for about a week and i just want to know what it does besides chi and ki and energy flowing within you
The same thing all pseudo science does: placebo effect.
depends what you are calling meditation. There are a lot of practices that do different things but people use the same word for them.
Ideally meditation should take you into a state of thoughtless awareness where your emotions, mental state etc. all have a chance to replenish and renew themselves. The mind becomes used to being in the resent moment and so becomes much more efficient and clear because it is less encumbered by past conditioning or ideas about future. There are many other things as well which should happen when you go into meditation.