I kind of stumbled on your blog since I've been having recovery issues do to my over indulgence in training/working out. I'm 62 and have been an endurance training athlete from the age of 28 through the age of 46, running and then cycling. From 46 on I consider myself more in exercise mode without the competition but still end up from time to time in training mode putting in upwards to 9, 10, and 11 hours of cycling and other exercises a week. After multiple weeks of this I find I've put myself through the paces to a point of exhaustion and experience the AF until I rest and recharge. My challenge has been to find a rate and frequency of exercise and recovery time to keep me healthy without bringing me to the point of exhaustion. Yes, I'm guilty of trying to train like I did when I was competing in my 30's and 40's. Thank you for this article!