The number of repetitions to choose should be decided with the goal and abilities in mind. 18 times can be a good amount of repetitions for newer people.
You do not really need to say "the energy of these runes", and can simply say that "I am now physically grown and energized in a happy and beneficial way".
In a general sense, one needs to state what they want, and how they want it, and all of this needs to be present tense as if you have already got it or you are getting it at the moment.

My body is energized versus my body is energizing.
Not my body will be energized!