I must have overdone it yesterday. All the running and a late night is too much for this 43 year old body. I did my threshold run on the treadmill late doors and boy was it a struggle. I had to use every trick in the book to keep going. I was firmly parked at the bottom of my threshold zone and every time my heart rate started to rise I would counter by lowering the speed. I covered the 10km in 32:41 (3;16's) which is still quick but it felt like I'd run a marathon. All up 14kms with the uppity up and downity down.
A few beers in the evening to help the legs recover.