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I started at 27 and have more than doubled my SVJ. Although to be fair I was almost intentionally de-training SVJ type qualities by running long distance (20km plus)  and being weak as fark (no strength training).

When I first read it I was like "oh man, this guy has a 54 inch vert!".

I don't think there's such a thing as a "typical" improvement, unless typical means "the guy reaches ~2.5x squat", since that's the squat value were more strength usually won't transfer too good to explosiveness. If you take a guy from a 0.7x squat and get him to 1.5x squat and he improves by 6 inches and stops his squat improvement to 1.5x instead of continuing to get it up to ~2.5, then how can you say that that's his near max ceiling of improvement?

So in reality you could say "your limit in terms of strength to SVJ improvement is probably a 2.5x squat" instead of throwing a number of inches or a % of the original SVJ around.

So if a guy has a 2.5x squat and jumps 26 inches, besides that he must be humongously unexplosive (and he should train that), then yes you could say that maybe the structure is very bad for jumping and therefore he doesn't have much ceiling to improvement.

But if you take formerly weak people, regardless of structure, with say a 1x untrained squat and get them to 2.5x, wouldn't you expect them to improve a lot? The only factor at that point becomes if they ARE ABLE to get to that ~2.5x number.

Maybe you're becoming more efficient at utilizing your current strength and then when you back off you lose that efficiency and fall back into using a lower % of your strength to apply in your jumps.

So either increase strength or keep on jumping.

So far:

Squat: 132 lbs x 5 to 435 lbs x 5
SVJ: ~27" to 36"

I got mine from ~20 inches to 30 while taking my squat from 80kgx5 (90 1RM) at 67 kg bodyweight to 120kgx5 (135 1RM) at 82 kg bodyweight. So as you can see that's a 10 inch increase in SVJ and I'm still under 2x in terms of squatting strength. Once and if I ever get to 2.5x I should have ~38-40.

So it's all a matter of strength, strength application and structure as the most important factors (if we're to ignore the factors I talked about in my previous post). So basically it depends IF you can increase your strength as far as a 2x-2.5x squat to reach your genetic limit more or less.

So your argument is that making estimations in life where the dependent variable is influenced by lots of factors is "stupid" and "launching numbers around"?

So I guess then that predicting the weather is stupid, predicting stock values is stupid, predicting demographic development is stupid, analyzing the intellectual potential of a child is stupid, etc.

What, you don't have an answer for what I said and you came up with this?

GETTING BACK TO SQUATTING AND SVJ, what I said holds true. If anything, it's probably easier to increase the SVJ than it is to increase the running VJ if your RVJ technique is already at a high level for your particular structure because the SVJ responds better to strength work and strength is a more alterable quality than reactive stuff.

Hm, so let's see:

If I have a 9 inch vertical jump, I can expect to get to 12 (+30%) but that's pretty much it? And the more I can SVJ the more I gain, right?

If I have a standing 50 inch vertical jump, getting to 66 inch (+30%) would not be impossible, right?

So if I suck having a 9 inch vert I actually have a much lower ceiling of growth than if I were to jump 50 because 30% of a small number is less than 30% of a higher number.

See how idiotic this gets?

If you take a guy who has a 0.7 bodyweight squat and jumps 16 inches and get him to 2.5x, would you expect him to get 30% more on his SVJ OR would you expect him to possibly double that or more?

Here is some good compression:

If that were true I'd have a 2x squat since 3 years ago. If it was as simple as putting a bar on your back and doing your workout and your squat will increase liniarly.

By the way - just threw down a dunk at the 2.96 rim off standing VJ again - in the past (~2 years ago) I could barely touch the bottom of the rim off SVJ if anything, so that's a ~8 inch gain just by that.