The Will to power is composed on the one hand of 'will' which concerns an agent, and on the other, 'power' which belongs to life, the cosmos, force itself.
The Will to power is a necessary feature in all life. Where I found a living creature, there I found the will to power.
The Will to power is a broad will stretching beyond the limits of the body in which 'life' is only one of its special cases.
The Will to power is larger than the 'will to life', exemplified by the martyr who says 'you can kill me, you can do anything to my body, but you cannot touch my principles because I am powerful enough to resist all your threats'.
The Will to power is not exercised mysteriously on muscles or nerves, still less on 'matter in general'. It is necessarily exercised on another will.
The Will to power is not a matter of simply satisfying one's wishes, as such can be mere luck or happenstance. Rather, the will to power can manifest itself only against resistances... therefore it seeks that which resist it.