A Workout At Work

I've had jobs in the past that have really spurred muscle growth, especially in my arms. I had a job once in a cheese packing plant where I was lifting hundreds of 50 pound blocks of cheese every day. Needless, to say, I was exhausted when I got home every night. My arms had all kinds of muscles growing, though. My current job doesn't really do much of that. My fingers sure get a workout, but I go home every night mentally exhausted instead on physically exhausted.