As we age, it is astonishing how quickly we can lose conditioning. I just did a very easy 10K and found myself laboring early on. My training has been inconsistent (at best) over the past several months due to the intensity of my schedule. As a result, what should have been a happy, little jaunt, was transformed into a serious workout. According to the sage observer, "the bigger they are the harder they fall," but in my case I think it might be more accurate to say, "the older they are the quicker they flag." Ouch!