Am I over-training?

Drop your mileage instantly if you are feeling this fatigued. Although you haven't given any information as to what workouts you're doing, etc., if you're feeling like you're overdoing it, drop it down to 45-50 for a few weeks and see how you feel.

I don't feel THAT fatigued. When I go for runs, it seems pretty comfortable. As for workouts, 3 weeks ago, I did a 2x400,300,200,100 hill workout, 20 200s at 35 with a 200 jog rest, and a 3 x Mile at 5:00 pace with a big 10 min rest. This past week I did a 3 x 300,300,400 with a 100 jog at about 50 for the 300s and 69 for the 400s and a 400 jog between sets, and 8x400 with a 200 jog at 68 pace.

Terry Kozma thinks thats way too much running. Dial it back a bit. Take up some video games to cool off.

Are you constantly thirsty? Or do you have to urinate frequently after drinking water?

You may just be dehydrated. Even if you're drinking a lot of water, your body may not be holding onto it very well if you don't have enough salt. You may be experiencing this if you keep drinking water after working out but remain thirsty and have to make frequent trips to the restroom. Your urine may be clear, but this is just because the water you're drinking in is going straight out.

Water is needed for recovery (and for every cellular process in the entire body). Maybe the scenario that I've described describes you?

If you're simply not making up your water losses, because you think you're not sweating, you should try to weigh yourself (preferably in the nude) before working out and after (preferably in the nude and after having wiped off any sweat). Use the restroom before each weigh-in -- urination counts as water loss too. You may not have any visible sweat, depending on the humidity and other factors, but you may be surprised at how much you actually sweat. My younger brother was training the other day for an hour doing hill repeats; he didn't have any visible sweat the entire time, but he lost two pounds of fluid, equating to about a liter of sweat loss.

Another possibility is that you're working out really close to your bedtime. Or do you perhaps use caffeine in the evening hours?

An elevated resting heart rate is a sign of overtraining, about 10% higher than normal.

I definitely believe that someone can train more before overtraining if they are in touch with their nutritional needs; and hydration is particularly important among these considerations. You may only be overtraining relative to your current nutrition.

So definitely make sure you're hydrated, if this was the issue.

Thanks a lot for the feedback. It could be a dehydration problem. I have noticed that I've lost about 3-4 pounds in the last week.

It's not a bad idea to drop your mileage for just a week by around 25%. Many of us old guys do that routinely once every four weeks or so. I'm doing similar mileage, and after three weeks at that level, I'll drop down to around 50 for a week, just as a preventive measure. As a younger runner who recovers better, you could probably go 4-5 weeks before taking a recovery week.

It is not too many miles, it is TOO MANY PUPPIES!!!!!!!!!!!