I've run 307 miles in the last 21 days and when I first started laying out my year I planned on doing a 3 week cycle with a rest block every 4th week. I felt very good on my morning run and am sitting here in my running kit ready to go again... but I need to keep my eye on the big picture. Improvements only come when we rest. Training breaks down our bodies and long periods of training accumulate stress and fatigue. Only when we rest do we gain strength. Even though I feel great I know I have done well over the last month. My health is 100%, not an ache or twinge, very little fatigue. Resting will almost guarantee an elevation in fitness and the next 3 weeks will be even better. I'll back off and hold my mileage and effort down for the next 4-5 days. There is a 5000 on the track in Boulder on Thursday night- this would technically be 4+ days of rest if I count the rest starting from Sunday morning. I count a day as 24 hours (go figure), so if you finish a hard run on Sunday morning at 9:00am and don't run again until Monday morning at 9:00am, technically you took a day off.
I'm running an LT test tomorrow morning with Gordo. This will give me a fairly definitive perspective on my fitness.