How much of that training is reading a book?

How much of studying go involves a book? Less that half if you do it correctly.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

Well, the risks associated with actual fighting is much higher than actually playing games, so I'm not sure if that's an apt comparison :p

The point was it's a poor analogy. Sure, books aren't really much of a part of boxing training, this doesn't mean that you don't do a load of training if you want to box competitively or that insei need to get the skipping rope out.

I would suspect that an insei should get the skipping rope out. Mental fitness is important, but it will not suffice alone. In most games physical fitness is also essential.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

Getting the skipping rope out was a reference to boxing specific physical training.

Tsumego books should probably be more than 50% of study alone.

Nonsense. Reviewing your games should be at least half of study.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

Nonsense. Reviewing your games should be at most 46.34% of study.

I think that the benefits of playing a lot diminish the stronger you get and the benefits of studying diminsh the weaker you are. What use is all the guidance, theory, and explanations in the world to a 28k player who still hasn't gotton much of a feel for basic shapes, concepts, or ideas yet? Just play more; it'll do you a lot of good. But what if you're a 6d amateur? You already know so much about the game (Which is probably still close to nothing at all in the grand scheme of things ). Your opponets aren't going to be weak either, and I doubt there's more that you can figure out on your own that you already don't know just by playing. Maybe there's a balance of the two at SDK levels.

I don't know about the SDK level being the midpoint specifically (shodan is starting to looklike where you stop being a beginner, as I get stronger), but this idea seems quite reasonable to me. After all, one usually doesn't give rank beginners the advice to spend 10 hours studying tesuji before they start playing.