Threshold run on the treadmill. Started the threshold at 3:15/km pace on 1.5% gradient (after doing some fast paced 20 second efforts to spike the heart rate). Up into my threshold zone within a couple of minutes. Then after 7 or 8 minutes I lowered the gradient to 1% and every 5 minutes or so thereafter I'd lower the speed slightly whilst remaining nicely in the threshold zone.
After 45 minutes I had covered 13.5kms (3:21/km) and had lost half my body weight in sweat.
All up 17.5kms with warm-up and down. More threshold runs planned for the next 3 days with a monster one planned on Sunday. Some nice weather please as the treadmill is a mind-f***.