Universal Formula for Powerful Kicks

[Touch Of Death]

Our sensei teaches us that during the 'chamber', the leg is tucked as far in as possible, or as he puts it, "Try to kick yourself in the rear with your heel." We don't hold it that way; the moment it's chambered, it's delivered with force. We also do not kick above the obi, so that may have something to do with it.

I was taught that as well. If you kick someone in the knee, but cock your knee at groin level, you just went up before you went down. I agree that TKD kicks should be done like TKD kicks, but logic rocks too.
Sean