I have been daydreaming about this for a while now, and have decided to put pen to paper. It seems, as mass is stored energy, we could make more or less mass in the human or other bodies by using fuels and mass editing to make people bigger, thinner and younger. This follows that we could either make muscle tissue more intense or even bigger too, more sensitive and so forth - this is the end all of all health care in the world.
If we want to make someone 'bigger' naturally, we could easily edit the genes to grow that way quickly, as, the body follows the genes. This means, if we were to edit the genes with some information, in the form of micro bots filling in gaps and acids eating away slowly at other ends and parts, we could easily make the children of the people more like that. This would require some chemicals in the form of molecules and gluons, where the gluons would hold everything together, maybe even making 'ratios' or 'pieces to the puzzle' for how the people want to grow or their children to look. Hell, this coul dbe done by borrowing the d.n.a. of someone else, either completely, or, as 'parts.'
But, for faster results, where the parent would take on these characteristics themselves, we would need only to observe, as I said, mass is stored energy, so, we could run a low or high frequency current or radiation through the person to make the energy needs meet the d.n.a. information as quickly as possible, of course.