So shadow boxing is when you throw a punch, you image your opponent may respond in a certain way, you than take advantage on his respond.
For example, if you throw a hook punch, you may image that your opponent may dodge under your hook punch, you then change your hook punch into a vertical back fist (to strike on top of his head), or a horizontal back fist (to strike on the side of his head).
So shadow boxing is the same as a predefined punching combo. Am I correct?
By the very nature of providing yourself with two options, you are already making it so that it is
not a predefined combo.
Kind of like
@jks9199 said, there are different ways I shadow box.
Sometimes it is improvisation of technique and combination, just to move around or try out new combinations and how well they flow together. Kind of like a guitar player just improvising instead of playing a song that's already been written.
Sometimes it is like you said, work through a technique or combo, think about how my opponent might respond, and then how can I respond to that? For example, in Taekwondo, if I start with a roundhouse kick, how can I respond if my opponent moves left, right, forward, backward, or any diagonal combination of two of the above? What pairing of footwork and kick will land a technique on them in that position? Then I have 6 different combinations to drill (because back-left and back-right put them far enough away I might as well reset).
Sometimes it is doing the technique and seeing what you leave open. For example, if you a basic jab-cross-hook-uppercut combo and you notice your hands are down for the last two punches. Because you're the only thing present (no heavy bag, no opponent), you can focus more on what it is that you're doing, instead of on a target.
I think one of the biggest things is it gets you
away from just doing rote drills. Even if you're working on a specific combo or theme, you should be putting in variations in things like footwork, angles, follow-ups, head movement, etc. To use your example from the OP of a jab-jab-cross, you might have the following progression:
- Jab-jab-cross in place
- Jab-jab-cross moving forward aggressively
- Jab-jab-cross moving diagonally aggressively
- Jab-slip-jab-duck-cross to mix in headwork
- Jab-jab-uppercut because your opponent might have ducked
- Jab-jab-elbow because your opponent might have closed the distance
- Jab-jab-kick-cross because you're not doing boxing
You can do these on the heavy bag or in a number of different drills, but you can be more fluid in how you adjust them in shadow boxing.