I haven't seen my exact question answered in my research, so hopefully this is not a duplicate.
I am building a world where the human race on another planet has a reason to genetically enhance themselves to become as strong as possible. Using a combination of advanced science and magic, they have achieved 10x the strength, durability, and stamina, of an un-enhanced human, without changing their size or appearance. Based off of my own research so far (not exhaustive yet), all the discussions I can find talk about a max of 3 or 4x the strength of a normal human, which by itself would necessitate things like :
- Stronger organs, especially heart for blood and oxygen flow (the standard response to this is stronger means larger).
- Denser bones
- Tougher skin
- Increased appetite and metabolism to keep up with the greater mass
See Quora answer here for some reasoning behind this: If I had the skin, muscle, and bone tissues about 3 times as dense as the same tissue of a normal human body, how strong and durable would I be?
It would follow that 10x stronger would have more needs and side affects than 4x times stronger, so I am looking at what those would be.
Side effects I have considered and have ideas for:
Not enough space for better organs
Body too heavy
Blood flow difficulties
Need for too much food
How to make it pass on to children
My question is:
Assuming I can convincingly explain why the 10x human was able to be created in the first place, are there side affects I haven't considered that would make this implausible? What have I not considered that might ruin any believability this could work scientifically?
I know I could explain it with magic but like I said would like at least a good foundation believable from a scientific point of view, the magic would have just been there to make doing the original adjustments/surgery easier, or picking up just a little slack.