DNA is a multipurpose blueprint for proteins. There's not enough information (25,000 genes) in our DNA to actually affect just one thing or another by altering it, because the proteins mechanisms built from it are used in an extensive network of different actions & reactions. So if you were to alter
A gene to fix
B problem caused by
Z process, you'd also affect processes
Y,
X, and
W likely leading to other problems. Not to say you couldn't help someone that way, but you should study the complex system you're delving into.
"If it's not broken, don't fix it."That said, if you're working with knowledge from that level in an intuitive / direct sense, you should be able to play the part of a repair-person and follow instructions from your subject's body, such as were to go and what do to there. When it comes to our bodies, that part of us knows a lot about itself.
A simple technique that can help demonstrate this is if someone has a sore limb (nothing serious), just support it's weight (make sure you're properly braced if it's heavy) and help it to move and/or twist it. You can eventually get a feel for where it wants to go, you can feel physical resistances and weakness for where to move it. I'd suggest starting with a hand or a finger, you don't have to massage or anything, just move it slowly.
It's particularly beneficial because it allows all the muscles to relax, rather than just some; you can do it to yourself, too, but it's more limited because you can't properly do it when you're using related muscles. However, it is possible to stretch various muscles while floating in water, since you're not using them, just tune in and be careful to not inhale liquid.
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