My primary goal now is muscle building, but I wonder if since I'm over 50 I need to allow more recovery time than before or risk overtraining. Each week I have been trying to get in three MIS (sometimes need to split upper/lower on different days), or a set of the Pure Strenth tapes plus one MIS or the set of Slow and Heavy tapes plus one MIS. I seem to tolerate this just fine, but my energy level to do much, if any, cardio really flags (lucky to get in one or at most two kickboxing tapes, which I like). I haven't been skimping on good food and get plenty of sleep. Since I'm sure Cathe has a long way to go until age 50, I'd also like to hear the experiences of any of you other boomers.