It can be found on a shelf next to a radio in the workout room of the Green Country Lodge.
Traveling Salesman: Arm day. Three sets of twelve reps. Let's see... Dumbbell bicep curls. Tricep extensions. Hm. And back extensions. Little chuffed 'bout the lack of proper equipment. No bother. Chin up! Only eight more luxury coffins to make quota in Backwoods-- I mean, Flatwoods. *laughs* Will be difficult given the... ehrm, "financial" situation 'round here. Just need to remind them of our friends the Chinese, and I'll be back on the plane to Ipswich within a fortnight. *sigh* Gather it'll be the benchpress today, yet again.
The traveling salesman is also referred to as the "gym rat" in the game's files. Gideon Emery, who voiced the salesman, is credited as the gym rat.