Eat a hambur- no, wait... PIIIZZZAAA! Yeah.
Oh, and learn how to use punctuation. And correct spelling. The act of concentrating on correct finger placement (spelling), and the additional reps (by adding in the punctuation) will create tension in your digits, which, by the force of irradiation, will transfer to the rest of your musculature, thereby stimulating your enitre body to grow. As you type, spread the floor with your feet, and clench your glutes for added lower-body involvement.
Bam. Weight gain.
(a few extra chicken breasts mixed with lifting heavy shit never hurt anyone, either.)