Aikido is full of people who line up their body, distrribute their weight, relax, and express a great deal more force than they can account for. Rather than see that they simply didn't realise what the controlled body is really capable of, people attribute ridiculous things to "Ki." Nobody ever opened a door with their "ki," they opened it with the weight of their body.[/b]
I remember hearing a story about Koichi Tohei sensei a while back. Tohei sensei was asked during a dinner by someone if he could move a glass of water with his ki. Tohei sensei said, "Of course!" and proceeded to pick up the glass with his hand and moved it across the table.