This board would not improve if we didn't have some lively debates, so rather than back away, I would love to keep hearing from you.
Thank you for your post. I appreciate your attitude about it and would enjoy talking about it further. I would have responded sooner but have been out-of-pocket for a few days.
One of the things that I noticed in the original post was that the workout that caused difficulty was both a different exercise (Elliptical vs. biking) and a different level of intensity (low vs. medium/high). Since response to training is impacted by both the specific exercise and the level of intensity either or both of these combined could explain the response rather than over training. Also anyone's performance can vary on any given day based on stress levels, amount of sleep, what they eat, whether they consume alcohol or caffiene or other factors. So, even if the exercise and intensity were the same I wouldn't jump right to over training as the problem unless there were other symptoms present. I'm not saying it couldn't be overtraining. I am saying that there are other possible explanations and there really isn't enough information to make that judgment.
I also don’t agree that 5 days per week is the maximum that anyone should train even if they are trying to improve. There are many things that can effect a training schedule. Depending on the specific situation 5 could be not enough, too many, or just right.