In Isshin-ryu many years ago I learned a very particular way to do the knee strike (toes and foot pointed back, lower and upper leg in close contact). Now in JKD I'm learning a very particular way to do it again (thrust the hips forward with the knee strike). In most other systems I've studied it's been "just knee them" however. Is there a particular way the Kenpo knee strike is thrown or is it just a knee strike? The Isshin-ryu style was meant to protect against it being grabbed while the JKD stule is meant to make it a stronger strike, as I understand the reasoning in each case.