I am doing a project for a sports performance class involving a TKD sidekick.  One of the criteria we want to measure is power.  I seem to remember there was this "pressure plate" thing that martial arts suppliers used to hawk at tournments to measure the power of a sidekick.  You kicked the pad and it gave you a number.   Does anyone in the Silicon Valley Bay area (Or your dojo) have one of these gizmos I could borrow for a day?   Or, does anyone have any suggestions on measuring power?  Measuring vertical jump is the gold standard, but is there another way?   Thanks much!