Like all ki manioulation techniques, the effectiveness of the Genki Dama is dependent upon the amount of energy pumped into it.It is also due to this that Gokū becomes unable to use the technique while in his Super Saiyan state, as the rage and savage Saiyan tendencies induced by the transformation make the heart and mind clouded. Genki Dama is a technique which can only be performed by a mind undisturbed by negative thoughts in other words, a pure heart, which is what makes Gokū such an excellent user of the technique, and possibly explains why the Kaiō of the North never taught the technique to the other members of Dragon Team that had trained under him on his planet. For Gokū, he demonstrated the act of borrowing energy from planets near Namek on his own, and years later, managed to acquire energy from the living beings on Earth with the help of the Kaiō of the North's telepathy. The actual range in which one may actually be able to gather energy for the Genki Dama is not quite clear, whether there exists an innate restrictive range that one alone may be able to reach or if it is a range that is dependent upon the skill of the technique's user, but what appears to be certain is that the range does seem to depend upon the user's ability to sense the energy they are seeking to borrow. In earlier uses, Gokū could only gather enough energy toward his clenched fist, but other times, he would raise both hands upwards and hold his palms out flat so as to focus the accumulated energy into a massive sphere above his head. The accumulated energy gathered by the user is gathered at a specific point. The user, who must be at internal peace, focuses their thoughts on living beings around them - animals and plants, anything with a life force - and pulls on their energy. What sets the Genki Dama apart from most ki manipulation techniques in the series is that it is fueled by the energy gathered from one's living surroundings. Considered to be the ultimate technique of the Kaiō of the North, as well as the trump card of his student, Son Gokū, the Genki Dama is regarded as a powerful technique geared toward the destruction of the victim.

Super dragon ball z ost