The book reminds me that I was once a runner. I once did 100+ mile weeks, 34 minute 10ks, and 2:40ish marathons. Was a LONG time ago. When I run today, I swear it feels exactly the same--sometimes the runs are a struggle and sometimes I'm flying like the young man I once was-or so it seems. I'm reminded of the classic Greg Lemond quote where he commented on winning the TDF: "It doesn't feel any easier, you just get faster". He was saying that it's all the same--you always hurt when you push. So my old man modification to Greg's quote is: "It doesn't feel any easier, you just get slower".
That said, once a runner, always a runner. In this transition phase between my IM in November and my earnest base building of 2008, I have returned to my running roots. I'll train mostly as a runner in December and look forward to a couple of 50-60 mile weeks. As I transition back to a triathlete's regimen in January, I hope this return to my running roots will lead to a return to some of my prior running glory. If not, it's at least a nice change of pace.