Like troutkick I also just started MA at the age of 46 with no prior background at all. I am in pretty good shape though as a competitive paddler and cyclist. However, regardless of my fitness level and that I have been a lifelong athlete, I can honestly say that I have never experienced such agonizing muscle pain as I did after my first takedown sparring session! Perhaps as a result of being full of adreneline and desire to show my sensei that I have actually learned something in the last 6 weeks, I probably went at it a little hard. Lesson learned...I'n not in my 20's and I need to take things a little slower! Regardless, the pain feels good, in its own weird way, and lets me know that I am really doing something different.