As he watched his lats slowly tearing apart the seams of his shirt Guy realized that he didn't really want to stop growing yet. He knew this was crazy, but it was just too amazing to resist - knowing that his strength was increasing by the second, seeing his muscles swell bigger and bigger, feeling himself becoming thicker and heavier.
He flexed his right arm, hardly able to believe how the new size of his forearm, biceps and shoulder, and only dimly aware that the movement had caused the tears in his shirt to widen dramatically. His shorts, too, were losing their fight to contain the amount of muscle that was continually added to his already huge frame.
After a while, Guy's curiosity got the better of him, and he came out of the corner in the gym's locker room where he had been trying to hide. He walked, or rather, strutted back to the scale room, loving how muscles rubbed against muscles with every step, every movement he made. Just as he stepped onto the scale, he could hear another ripping noise, and he soon figured out that a new tear must have formed in the fabric of his shirt because his back had simply become to wide to be contained by the formerly loose piece of garment.
He re-focused his attention to the number on the scale, which turned out to be quite difficult to see because his huge, growing pecs kept getting in the way. He only just managed to peek beyond the huge mounds of muscle pushing outward from his chest, and it took him a while to process the figure he had just seen.
"400 pounds," he muttered. "400 fucking pounds of muscle..."