There are physical limits to the strength of the body itself, so in order to overcome that barrier, it’s necessary to increase your “ki”. Normally, the more you increase your ki, the harder it is to control, so ki control is also important.
Without any Ki, No Transformations, No Fusion, Only physical strength.
How strong etc etc are Vegeta & Goku ?
Speed, Strength, durability, sight, hearing, all physical stats where do they stack up.
^Pretty much. Almost all of Goku's stats are primarily based on his Ki, so his Z self's physical limit in strength and durability would be below 40 tons without transformations in Z. In Super, you can assume it'd be more via-scaling from his Boo Arc self, though the only thing to suggest it'd be much more is him moving inside a black hole that sunk through Katchi Katchinko and that doesn't really say much on where he stands physically when the density of Katchi Katchin is pretty vague beyond being far greater than Katchin which is far greater than the Z-Sword which couldn't even be lifted by those weaker than Boo Arc Goku. We also have even SSJ Vegeta being unable to budge the leg of Magetta's 1000 ton body when trying to lift it, and an individual leg is obviously going to weight for less.
Overall, it seems like somewhere between 40-100 tons is probably the physical limit for Goku and Vegeta at this point without Ki enhancement.
You're not holding that bottle together with just 1 aspect, Ki.
But the physical container.
The physical form is going to be strengthened through training but it only goes so far.
That's where Ki comes in.
Ki helps the physical form go further & hold large amounts of Ki.
And Ki Control allows Ki to be evenly distributed throughout the Physical Body.
But if Ki exceeds Control...
.....Well
Imagine reducing Control little by little of the same substance you're using to strengthen that bottle that's also inside the bottle as well.
The physical bottle itself is left dealing with the work load of the substance right.
Ki Control is the same.
The more Ki exceeds Control, the more the physical form suffers.
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Then You get Grade 2 & 3.
And as that is still a physical body containing all that Ki & there's little to nothing keeping the physical body from dealing with all the stress,strain, etc that much Ki puts on it.
Grade4 changes that by improving all of the above including physical conditioning.
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The bottle doesn't explode, doesn't lose its shape, & holds the substance perfectly inside.
