When you do an upper body strike while advancing, do you strike...?

Here is a general answer for punching power. From a forward stance the reverse punch is the strongest. In other words if the right foot is forward the left hand punches harder. If the left foot is forward the right punch is the strongest. Now if you land a punch with the same side, as in punching with the right while stepping forward with the right foot, if you land the punch as your foot sets down you will have more poser in the punch. Think about it as a controlled way of falling into the punch, which adds your body weight to the punch.

Note: I thought you wanted someone to look at your Kata and critique it? That is what you said in one of your past questions.....

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I wholly agree with Bogeyman in that the strike should be executed just as your foot lands. There is certainly a risk that when you do step or even if you have the intent to step, experienced aikidoka or judoka or anything of those sort may pull you off balance. Though if you are at a range....as you refer to 'advancing,' as opposed to close quarter punches, he has to at least touch you to off balance you. Even aikido which focuses more on off balancing against someone coming in instead of in a clinch as say judo, have flaws in that some faint could trick them off.

Think of it as this way. When you lift your foot, you've gained the gravitational potential energy of at least some of your weight. If you step forward, that's using some of that energy as kinetic the punch should be backed up by this the faster the better. However if you do it that late and your speed basically reduces back to 0, in a static stance, then you punch...you're not going to get much energy in. What's the purpose of that as opposed to say...step forward and straight punch. The timing gap Bogey suggested is where you are most likely to transfer most of that energy into the punch.

Too early, and your center of mass is still a bit high to get your weight transferred. Too late and not enough goes into the punch.

I can't speak for other schools. But we teach that you step 1st then punch when doing kata. This helps generate power and you have better balance. This also allows you to do other things like change the strike or to retreat if necessary.

The drop step. The fencing lunge. The Xingyi drive linear strike. All land just as the foot hits the ground or right before, using some advanced and modified personal timing.

A jab or straight shot can still pack some power if your lead foot is grounded, but it has to be from your hip root. You will not have gravity assisted power. And gravity assisted power is several orders of magnitudes stronger than muscular acceleration.

Chinese martial artists can throw people on one leg. So can judo. That's real balance. Balance being flat footed on both legs, isn't really using the potential there.

The kata must contain some, if not all applications, of real world solutions. From the previous video, I don't think people use the kata movements in sparring. I think they just use their own techniques in sparring because it works better for them, and only do kata because it is required.

Japanese karate is rooted from Okinawan karate, which is influenced by Fujian arts such as White Crane in South ish China. The drop step isn't the only internal concept that uses gravity. There are others, which various karate bunkai researchers can probably prove.

For me, if kata is teaching a movement that has no real world counterpart, technique, or application, then there's no point doing the movement. Until you use the kata movements as actual movements in a test, it doesn't really matter what they tell you. There are other applications that particular movement can apply to, but it needs context. Your dojo's context is hand strikes and leg kicks, from the sparring tests.

So how does that kata movement apply there? It's not a throw. It's not a grapple. It's not a trap. It's not a joint break. Your dojo instructors don't test for that. So for it to be a forward strike, it has to use forward striking elements. Forward striking such as the jab or lunge prioritize acceleration, straight line attacks, and speed (no hesitation).

Why then would anyone wait until their foot was on the ground before even beginning their punching movement? Until you've been hit by a gravity assisted drill attack, you may be unconvinced. In martial arts, often times feeling is better than reading or seeing.

That is something only Kajukenbo can teach I learned most of that from Kajukenbo and it Emperado's Method and the thing is since people like KajuKat said I am not allowed to say but the other part of my hand and disarm technique is Judo, Tae kwon Do and Moore's Karate.

In real life, going down the kata path you are on, you will get hurt

If you strike before your foot lands in it's "advance" position then you only have one foot as a base to create power. Your strike can initiate at the same time as your advance but it should land an instant after your foot comes to rest so you can use the foot to drive force behind the strike. You don't wait to start your strike until after you have moved forward, but your timing should allow the foot to "base" for greater balance and power in the strike, as your fist makes impact.