just finished 'bike for life' by wallack and katovsky. aimed at middle-aged on up riders. lots of good info, some of perhaps a little dated, coming from 8 to 10 years ago, but still quite informative. i'm not totally taken with the goal of riding a century when i'm 100, but 75 or 80 seems possible. i've also put on my laptop and have been using 'cycling anatomy' from human kinetics publishing. this is a book of exercises for cyclists, many of them performed on the exercise ball (which i like to use very much). i think i'm like many others who neglect strengthening the core despite putting in a lot of miles. trying to change.

any other good reads out there you have found helpful?