He gained muscle.
His normally thin stick-like body was now becoming slightly muscular.
David doubled over in pain as every muscle in his body ached.
Then after a minute or two, as quickly as the pains and aches came, they stopped.
David found that to his surprise, He was now a little more muscular than before.
he looked down at his upper arm and could not believe what he saw. His arm was a lot thicker than he could remember. Also the veins in his arms were clearly visible, pumping heavily with every heartbeat. Out of curiosity he flexed one of his arms a little, and to his surprise the biceps responded by growing into a decent peak. He whistled in surprise.
he looked quite buff, filling up his clothes nicely.
His pants were a little short showing his ankles & were fairly tight around his larger quads & calves.
His shirt was filled out to the max stretching it to the max do to his larger pecs, shoulders & arms. It outlined every muscle including his chiselled 8 pack abs.
His clothes felt a bit tight, but they still fit him.
"Wow!" David said. "It's like I'm a different person!"
He wanted nothing to do with exerting exercises or lifting heavy weights. He did however wanted, as all men, a more muscular body, but the only way to reach that is to exercise.
Everyone in the workplace was amazed to see him.
At lunch time, another tf happens to David.
That tf was....