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How do?

So, the Rubicon Primaris, eh? Basically a way to Captain America a Space Marine.

It makes them stronger, faster, tougher - and taller.

And it's the taller bit that made me realise something. And it's based on how young men's bodies naturally develop.

Did you know, that when boys go through that period of life, the body grows faster than the brain can adapt. This is why teenage boys are often seen as clumsy and uncoordinated. The brain's instructions are instructions for arms perhaps half an inch shorter. Legs an inch shorter etc.

Surely Marines that undergo the Rubicon must experience a period of much the same clumsiness? Where their running looks gangly, rather than sleek. Where they trip up over their newly enlarged feet?

As I said, this is a serious question - but an inherently silly topic!

Do young male sports athletes look gangly and awkward?

No.
Why? Because they have had months/years of training and coaches and instructors guiding them along.

Exact same for Space Marines imo.
Everything they do from indoctrination is to breed them into perfect killing machines. Theres no room/time for awkwardness.

Pretty sure whats being discussed is the immediate post-procedure period, not the "its been a year and I'm out in the field shooting bolters with my buddies" standard of lads on deployment.

Sterling191 wrote:
Pretty sure whats being discussed is the immediate post-procedure period, not the "its been a year and I'm out in the field shooting bolters with my buddies" standard of lads on deployment.

I don’t expect it to be a problem. At worst, it’s probably just “Oh geez, I’ve had my entire chest cavity cut open and my fused rib cage opened for an intense surgery. I may need some time to recover.”

 Mad Doc Grotsnik wrote:
How do?

So, the Rubicon Primaris, eh? Basically a way to Captain America a Space Marine.

It makes them stronger, faster, tougher - and taller.

And it's the taller bit that made me realise something. And it's based on how young men's bodies naturally develop.

Did you know, that when boys go through that period of life, the body grows faster than the brain can adapt. This is why teenage boys are often seen as clumsy and uncoordinated. The brain's instructions are instructions for arms perhaps half an inch shorter. Legs an inch shorter etc.

Surely Marines that undergo the Rubicon must experience a period of much the same clumsiness? Where their running looks gangly, rather than sleek. Where they trip up over their newly enlarged feet?

As I said, this is a serious question - but an inherently silly topic!

As the others have said, it's probably dealt with via the hypno therapy and such to make that period minuscule at most.

But it's funny to think about.

It’s definitely a thought about the immediate aftermath.

Using myself as an example? I had pretty bad growing pains. Apparently, that’s where the skeleton grows faster than the muscles can keep up with. I used to be tiny, but am now 6’2”(ish, depends who is measuring, bizarrely).

And that lead to period of extreme awkward and clumsy as my brain caught up.

But for an Astartes? Just as with Steve Rogers? It’s comparatively instantaneous, so far as we know.

So those first couple of days (maybe more, maybe less) could cause them to walk like a Fawn on Ice. Yes with training it’s something even a humble human can adapt to quickly, but even so it’d be proper comedy for a bit, watching this beefierbeefcake (steak Cake?) transhuman literally find their feet in this and improved body.

But as I said. It’s a serious question about an inherently funny possibility!

The other question of course is how clumsy the first to cross the Rubicon would’ve been, as there’s literally no-one to guide them through it. Imagine Calgar, canonically the first of note. How many times do you think he’d have brained himself on doorways?

 Mad Doc Grotsnik wrote:
How do?

So, the Rubicon Primaris, eh? Basically a way to Captain America a Space Marine.

It makes them stronger, faster, tougher - and taller.

And it's the taller bit that made me realise something. And it's based on how young men's bodies naturally develop.

Did you know, that when boys go through that period of life, the body grows faster than the brain can adapt. This is why teenage boys are often seen as clumsy and uncoordinated. The brain's instructions are instructions for arms perhaps half an inch shorter. Legs an inch shorter etc.

Surely Marines that undergo the Rubicon must experience a period of much the same clumsiness? Where their running looks gangly, rather than sleek. Where they trip up over their newly enlarged feet?

As I said, this is a serious question - but an inherently silly topic!

This is a myth. I'm a sport science lecturer and my specialism is skill acquisition which encompasses physiological (including neurological), psychological, technical and tactical etc etc... This does not happen, well it does, but the adaptation to it is very very very quick.

Lack of coordination in teenagers is usually due to a lack of development and practice in their earlier years (lack of physical activity and/or lack of specific development in some areas).

Anyway, the marines are very proficient athletes with a very developed and efficient CNS, they'd adapt by the time the body has healed from the procedure.

Considering how "engineered" they are and some brain level programming is needed to keep all the implants working correctly, I would assume it would be child's-play to set their reach and general shape awareness with an off-set.

I vote for "immediate to no awkward movement".

Sometimes these "silly" musings can lead to interesting narratives.
Fleshing out these details give some measure of immersion to your fully realized 40k universe.

I can just imagine a large group of Mechanicus attempting to optimize the implanted commands to ensure full optimization of the new Primaris "upgrade".
"Q=What did Cawl mean by "the modules can be swapped out depending on measured physiology prior the the upgrade, with adjustments made during REM test loops to optimize the feedback to the host..."???, A="Plug in what the machine tells you to, during REM upload, the machine handles other stuff you do not need to be involved in."

Hypnocoding could reprogrammed the relevant brain centres. No, that’s probably not a real thing, but it sounds incredibly 40K, so could be a thing in-universe.

Spears of the Emperor describes an old marine undergoing the calgarian rites and it's pretty much like the OP describes it.

 Coolyo294 wrote:
Spears of the Emperor describes an old marine undergoing the calgarian rites and it's pretty much like the OP describes it.

spear of the emperor is a fantastic book, can't reccomend it eneugh

Not primaris-ing, but you see something similar learning to wear terminator plate in the Deathwing and Night Lords trilogy - since you have to wear it hunched over and almost on tippy-toes because your weight's so far forwards, the average recruit's response on wearing it for the first time is "how are you supposed to walk in this ****!?!?!?" followed by falling over.

locarno24 wrote:
Not primaris-ing, but you see something similar learning to wear terminator plate in the Deathwing and Night Lords trilogy - since you have to wear it hunched over and almost on tippy-toes because your weight's so far forwards, the average recruit's response on wearing it for the first time is "how are you supposed to walk in this ****!?!?!?" followed by falling over.

IIRC some of them also struggle with the momentum they build in the suit and run into walls as a result.