Jeet Kune Do..."Way of the Intercepting Fist"

I love the fact that JKD uses an 'intercepting' philosophy, but what exactly are we intercepting?

I am sure it is much more than a 'fist'...

"Sorry if the topics I am posting have already been covered here I am new to the forum and have not yet had a chance to review all the threads".

Thanks,
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"You will fight the way you train"!