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[AnotherLLer]

https://ibb.co/VVDQZ5z

This drawing explains a lot about ideal human proportions.

Basically, for a 6 feet man, his knee height is 53.5 cm only. I stand at 165-167 cm (night and morning heights) and my knee height is 50 cm, so just 3.5 cm less.

Now, it's a different matter if we check the hip height. As you can see, hip height is roughly 107 cm tall and the distance from upper knee to hips is 53.5 cm long. Navel height is 113 cm.

My navel height is 98 cm. If we subtract 5 cm then my hip height measures roughly 93 cm long. If we subtract my knee height, the distance from my upper knee to hips is about 43 cm long. That means 11.5 cm less femur length compared to ideally proportioned 6 feet man.

As you can see, most of the height difference lies in femurs. Tibia is just 3.5 cm and in total it's 15 cm leg length difference compared to 6 feet man.

Now, the most interesting part is arm length. You can see that his humerus is 38.2 cm long, whilst his forearms are just 25.4 cm. My forearms are 25 cm long, so just 0.4 cm less. As femurs, in arms humerus is the main bone where the most length difference lies between humans. My humerus is 33 cm long so he has 5.2 cm longer humerus and 0.4 cm longer forearm. His hand length is 20.3 cm long and mine is 17.5 cm, so 2.8 cm shorter.

5.2 + 0.4 +2.8 = 8.4 cm arm length difference in total. His demispan is roughly 91.4 long, so his armspan is 182.88 cm. My demispan is exactly 8.4 cm shorter at 83 cm, so my arsmpan is 166 cm long. Since his hands are 2.8 cm longer than mine, he gains 5.6 cm armspan advantage solely from his hand length alone. But, his arm length is just 5.6 cm longer at wrist level.

Some people have longer hands and fingers and can have up to 3 cm hand length advantage, thus 6 cm wingspan advantage compared to the same height person. Hand size is just like foot size, so irrelevant when comparing to actual limb lengths.

So, hypothetically, if I lengthen my humerus for 2 inches, my arm length will be ok for 6 feet height if we disregard hand length. Now, I'm not going to lengthen my arms as risks to rewards ratio is very small and IMO it's an unneccecary procedure if someone stays withing acceptable arm length to body length ratio after LL, so up to 4 inches total height gain from LL IMO.

IMO, if someone wants to have perferct legs to body ratio after LL, it's better to aim 1.618 navel height / post LL height. So, in my case, I'm 165 cm tall at night with navel height of 98 cm. This navel height is perfect for someone who is 158 cm tall with the exact same leg length as mine. I have to lengthen 10 cm in total to gain 108 cm navel height, which, when multiplied by 1.618, equals roughly 174.774 cm, which is very close to post LL night time height of 175 cm.

After 10 cm of lengthening, my total lower limb length (tibia + femur) will be 88 cm (versus 78 cm now). 88 / 175 ~ 0.50, which is ideal leg to body ratio for males based on various studies conducted. This ratio is currently 78 /165 ~ 0.47 which is low and my legs appear stubby compared to my upper body due to that.

Another interesting finding is that arm length without hands (humerus + radius and ulna lengths) should ideally be about 0.35 of total body height. If we add humerus and radius lengths of the man drawn on the picture and divide the result to his total body height of 182.88 cm, we get exactly 0.35 ratio ((38.2 + 25.4) / 182.88 = 63.6 / 182.88 ~ 0.35. Mine is 33 + 24.75 = 57,75 cm so when divided by 165 it exactly equals 0.35.

If I lengthen my legs for 10 cm in total, my arm length to body height ratio will become 57.75 / 175 = 0.33. Of course it no longer be ideal, but, in turn, my leg to body ratio will change from 0.47 to 0.5 which is more important for overall proportions and attractiveness.

So, basically, I have to choose from these two options: remain at 165 cm forever with perfect arm length to body height ratio but bad leg length to body height ratio (which is more important for overall atractiveness and should be no less than 0.50 and no more than 0.51 as going higher than that decreases overall attractiveness) or lengthen 10 cm (5.5 cm on femurs and 4.5 cm on tibia for perfect biomechanics and interlimb ratio), become 175 cm and get perfect leg to body ratio of 0.5.

Now, I can lengthen up to 12 cm in total and still remain at less than 0.51 leg length to body height ratio (roughly at 0.508, which is the upper limit and any cm above that will create disproportion between legs and upper body), but I prefer to not risk more than 10 cm, which is enough gain to become perfectly proportional and aesthetically pleasing. I might even lower it to 9 or 8 cm total (5 cm femurs and 4 cm tibia or 4.5 cm femurs and 3.5 cm tibia) for better recovery and less risks. Anything lower than 8 cm total or higher than 10 cm total is unacceptable for me.

I think that everyone should become familiar with ideal human body proportions drawn with mathematical measurements and study his / her own body extensively before concluding how much to lengthen in total.