Is the job of a USPS mail carrier tiring?

This is the question new employees ask the most. Whether it's tiring depends on the route and the staffing at your station, but the most grueling part isn't the walking—it's the unpredictable daily volume. It might look okay in the morning, but then another truckload of packages gets added right before you head out, and you might even get sent to help with other routes in the afternoon. If you…