Chi is the electrical energy that courses through our bodies, so yes I believe in it. If the mind controls the body, it only makes sense that one would be able to master the currents of electricty of our neuro system as well.
Quantum Physics does a good deal to support the concept of remote chi control. One of the basic concepts in Quantum Physics is that something over here can directly affect something over there with absolutely no observable connection. How this is done is anybodies guess, but like it was said earlier, just because we can not prove something, does not mean it is disproved.
"...When I sharpen my flashing sword and my hand grasps it in judgment, I will take vengeance on my adversaries and repay those who hate me..."
Deuteronomy 32:41