<human>: I registered for a half in October, and in the confirmation email I learned that this is the first race in a double race weekend. So the following day is a second half marathon, and completing both would get me a sweet third medal (because we all run for the bling, right?). At first I thought, "No thanks, I'm planning on running another half three weeks later." But now I'm thinking about it, and I'm tempted to challenge myself.

A little about me: I'm mostly a novice. I've been running for a couple years, and I have one half and one full marathon (last month) under my belt. 

Has anyone out there run two halves in one weekend? Care to offer your experience? Would this significantly alter my training? 

I think it sounds like a great way to challenge myself, but I think I'm still riding a bit of the "I can do anything!" post-marathon high. But being fairly new to long distance races I don't want to injure myself. I also don't want to keep saying "I'll do it next year."

Of course, no one can tell me what to do or what not to do, but I'm curious about other people's experiences with these kind of two-race weekends.

Could you distill the essence of the text into 1-3 sentences?
<bot>: I'm considering running two half marathons in one weekend, but as a novice runner I'm looking for experience/advice from other runners who may have run similar "back-to-back" races.