Ok, so I'm not really a traveling salesman, but I am traveling for 3 of the 4 weeks in September for my super-cool new job. I'm halfway through week one, and I just got done paying $16.23 ($15 plus tax!) for the privilege of working out in a Gold's Gym down the road from my hotel. That's highway robbery!
But I'll probably continue to pay similar fees in my travels, since hotels don't really quite understand the concept of a "fitness room." See, cardio is but one aspect of fitness. And, in my semi-informed opinion, it's the aspect of fitness that it most easily taken care of by paying attention to the other aspects of fitness, such as strength, speed, agility, endurance, etc.
But the wonderful folks at Holiday Inn and Hilton (yeah, I stay classy on the road!) seem to believe that all of their patrons' fitness needs can be met by stuffing two treadmills and an upright exercise bike into a converted guest room. If they're feeling particularly generous, they might throw in a nice big swiss ball to do crunches on.
But I'm traveling, sleeping and eating on the company dime, so it's definitely worth shelling out $15 every couple of days for a decent workout.