Somehow I've been initiated into the running crew at work and this means I'm on the office email thread about local road races and have to do stop-and-chats if I run into one of them at the water cooler in the break room. They're all doing a local 5k/12k this weekend and when I said I'm doing the 5k they looked at me like I had 3 eyes and joked about me being a wimp. I told them I'm not in shape for long distances because I'm focusing on 800/1500 and am not interested in racing longer than 5k. This didn't seem to register.
How can I explain this better next time?