There are times when it's appropriate to convey exertion at a job--when you've just lifted a large bag of cement, for instance. Plucking one note on a guitar doesn't fall into that category, however--as much as some artists might to try to convince you of it in concert.
The next time I type a sentence at work, I'm going to grimace in pain as I place my hands on the keyboard. Then, I'm going to wipe the nonexistent sweat from my brow and fall on the floor, exhausted.
Of course, I won't forget to say, "Thank you, St. Louis!" It's important to remember the fans.