Please follow this link to see an interesting article about Bruce Lee and Speed Training. http://www.blackbeltmag.com/archives/blackbelt/1992/oct92/speedoflee/speedoflee.html
I only quickly scanned this page and couldn’t find any reference to one of his Peripheral Vision / Reaction Training Routines. So if I am duplicating (and possibly corrupting the information, I apologise).
We are all aware of the concept of "physical speed". I am talking about "fast twitch muscle speed" and that it can be increased by correct repetition training, over a prolonged, regular period. But what we do not commonly practice is reaction training beyond padwork or "coached sparring." (Both of which are essential).
To increase your speed of perception, it is important to maintain an attitude of "emptiness," or what Bruce Lee called "no-mindedness." You must learn not to concentrate too much on details. Look at nothing, but sense everything.
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(This was perhaps the meaning behind Bruce Lee’s famous "Finger pointing to the Moon" lesson).
I read (a long time ago), that a method used to create this "no-mindedness" state (and also work your peripheral vision reaction), was as follows:
Place a TV at waist height and switch it to an American Soap show i.e. "The Shield." (These programs have a high rate of camera angle changes). And turn off the sound. Then standing a few feet away from the TV, begin to loosely shadow box. Keeping your gaze at head height, firing out a rapid punch when you notice the scene change on the TV, without looking directly at it. (This may simulate reacting to a low strike etc). Try doing this for 20 or 30 mins.
I know it may sound a little weird, but it does work. You can then vary the position of your gaze, or parry and strike, or kick instead of punching.
If this article just makes you giggle, then fine.
If it spurs you to have a go, and to think outside the confines of the Dojang/Dojo. Then, even better.