I'm usually fairly fit however over the last few weeks I've been struggling to do what last month was relatively easy. I usually train 4 - 5 times a week and this consists of a lonely circuits session usually with a weights/bag work session on the day before my rest day. Of all my runs the only one I ever time is my 3 miler and aslong as its sub 21minutes I don't really care. However this time has been slipping alot and today I timed in at 25.10 and was dead on my feet. This kind of dip in performance is also reflected in my weights sessions and I appear to be losing reps but maintaining the same weights. I'm not getting stitches, I have no symptoms of cold/flu and my diet although not perfect hasn't changed. I'm still in my late 20's so its not as if my hair is going to fall out. In short... What the hell is up?