Original: 100% power Frieza is also able to attain 100% power, Dragon Ball Z manga, volume 11, chapter 127 his muscle mass becoming engorged compared to his previously sleek frame.
Simplified: 100% power Frieza is also able to attain 100% power, greatly increasing his muscle mass. At 100% this is literally the peak of Frieza's potential and the maximum amount of power his body can output; his muscle mass becomes engorged compared to his previously sleek frame.