Here's a question for the walkers in the audience . On any meaningfully hot day, if you're walking any great distance, chances are you're going to work up a sweat. It's a work day, you're in your work clothes (or are you?) and you're about to sit in your office for the next 8 hours. How do you handle it?
Do you even bother to walk once it gets hot out? How hot does it have to get? Personally I'm not a big fan of the alternate, which is jamming onto a hot and smelly train with a few hundred other hot and smelly people, so it has to be pretty darned hot for me to take that option.
Maybe you wear different clothes for the walk? One of my coworkers changes into shorts for the walk back and forth, and brings regular work pants in his bag. We actually just got a stern talking to from the company president recently when people had gotten into the habit of just wearing their shorts all day. Can't be doing that!
Lately as I arrive at work, the first thing I do is take a swing by the men's room, wet a few paper towels and clean up a bit. Beats the heck out of sitting in your cube dripping sweat (I know, ewww.) I keep telling myself to bring a handkerchief with me on the walk, but I keep forgetting. At least the paper towels you can just throw away.
It's never a bad idea to keep an extra supply of deodorant in your desk drawer, too. You know, just in case.
