Unless you really want to do yoga (I know you'll take any excuse to wear spandex), a solid stretching routine done a couple times a day should be, along with the weighted "stretching" effect of your lifts, should be all you need. Once your flexibility improves you could drop the frequency to once per day.
Glad to hear you liked Practical Programming so much (take note, sarge
). I must admit that I'm wondering how, if you're planning to be on, um, HRT, during this upcoming run, you'll know how much of the progress is the result of assistance and how much is due to effective programming.