Forms are exercise drills that teach correct movement, it also strengthens and conditions the muscles that are involved in that movement. BJJ does the same thing.
Forms include punching, blocking, kicking all of which are used in fighting. Punches in a system are performed a certain way. Not all fighting systems punch the same way nor do they generate power the same way.
There is no "Bunkai" in BJJ because BJJ is not Karate, However by defintion: Bunkai "
literally meaning "analysis" or "disassembly", is a term used in Japanese martial arts
referring to process of analysing kata and extracting fighting techniques from the movements of a "form" (kata)"
There is analysis and disassembly referring to the process of analyzing BJJ form/movement and extracting fighting techniques from the movement of a "form"
You cannot have a well developed fighting system without analysis of form/movement and extracting fighting techniques from the movement.
This is analysis and disassembly of movement. He is literally analyzing form (both movement and position). and extracting the techniques from the movements.
Any fighting system with specific movements that have to be done a certain way, has form. BJJ has movements that must be done a specific way, so those movements are the forms of BJJ. Fighting systems are nothing but a detailed analysis of attack and defend and extracting fighting techniques from the movements of a form.
This guy is running through his forms and the same benefits that kung fu gets by going through forms are the same benefits that he is getting through forms.
The following are his words not mine:
"We do this at the end of training to increase stamina, it's good to loosen the body, ... you can't be tight. So this works the lungs, It also works your mobility and the mind" "so this movement is for you to have power." All the benefits he's listing are the same benefit that people get from doing form in other martial arts, especially kung fu.
The concept of drilling a specific form/movement with analysis and extracting fighting techniques from the movement is the root of a fighting system. The understanding that a specific movement will have a specific result when done correctly (meaning using the correct technique at the correct time) is analysis all day. BJJ wouldn't have existed if Analysis of movement and form never took place.