One option would be a Kel P32 or P3AT worn around the neck with a break-away ball chain. They offer that accessory. I know a few runners who carry in this manner. The polymer frame and a stainless steel slide would limit sweat as an issue. Might be more difficult to not "show" in a very warm climate like Houston where there would be less layers of clothing.
In any event, no matter how carried, my choice would be the P32. I'm a former runner (50 to 60 miles per week at my peak) and never carried, but have a fairly good idea of the issues that would be involved.
In any event, no matter how carried, my choice would be the P32. I'm a former runner (50 to 60 miles per week at my peak) and never carried, but have a fairly good idea of the issues that would be involved.