JKD or Jeet Kune Do was founded by the late Bruce Lee. JKD is also known as Jun Fan Gung Fu, Jun Fan being Bruce Lees chinese name. Jeet Kune Do means "the way of the intercepting fist" but even Bruce thought that he chose the name to early. JKD favors formlessness for being formless means that one can take the shape of any Martial Art.
In Jeet Kune Do one has four fighting distances: Kicking range, punching range, trapping range and grappling range. Very few Martial Arts have these many. Usually they only have 2 or 3 ranges. The one inch punch is used in the trapping range. In trapping range you are too close for a kick and too close for a western boxing punch. It's short and very explosive and it doesn't have to be "loaded" to make damage. One needs to train very hard to get it right. I have been training Jeet kune do for about four years now and I say its about speed and timing.