Maximum Muscle
Maxing out your character's muscle mass usually means constant trips to the gym and monotonous weight lifting. However, you can instantly give your character a hulking, monstrous appearance by entering these buttons in the following order any time during gameplay: "Triangle," "Up," "Up," "Left," "Right," "Square," "Circle" and "Left." Should you want to revert to your skinny self and work your way to a more reasonable muscle mass the old fashioned way, enter: "Triangle," "Up," "Up," "Left," "Right," "Square," "Circle" and "Right."
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Monster Weight Gain
Just as frequent trips to the gym will increase your muscles, making stops at the various fast food restaurants too often will cause your character to gain weight. This transformation is usually fairly slow going, with only a slight amount of girth building up at first. However, you can turn yourself morbidly obese instantly by entering the following code during gameplay: "Triangle," "Up," "Up," "Left," "Right," "Square," "Circle" and "Down." Note that you cannot combine this cheat with the muscle cheat -- you can have all fat, or all muscle, not a combination.
Enhanced Abilities
To go along with your super-sized appearance, you can significantly enhance your character's physical abilities as well. To give yourself superhuman punches that will not only kill a target in one hit, but send them flying into the air, enter: "Up," "Left," "X," "Triangle," "R1," "Circle," "Circle," "Circle" and "L2." To make your character jump more than twice as high as usual, enter: "Up," "Up," "Triangle," "Triangle," "Up," "Up," "Left," "Right," "Square," "R2" and "R2."
Complete the Look
While physical size and extraordinary abilities are good start, you'll want to outfit your character with the right gear to match your changes. As far as your car goes, try the monster truck. You can make this formidable vehicle appear right in front of you by entering: "Right," "Up," "R1," "R1," "R1," "Down," "Triangle," "Triangle," "X," "Circle," "L1" and "L1." Next give yourself the heaviest weaponry possible by equipping the third weapon set. Press "R1," "R2," "L1," "R2," "Left," "Down," "Right," "Up," "Left," "Down," "Down" and "Down."