I offer you this link to mudra’s and how they work. Your body is a sophisticated system for energy transmission, and mudra’s allow for shifting currents to different channels of the light body for specific effects and benefits.

I began experiencing the very real effects of how energy flow can be shifted about a year ago when I tried a few mudra’s during deep meditation. I found that in normal waking focus that it was not easy to detect the differences in NRG flow that mudra’s can create. I find a quiet mind helps if you want to be able to actively observe the effects.