Did my run - energetic (for me). 35 mins and 6.2 k in total (rather slow I think). I put the treadmill on an incline of 1.5 and then did 8 reps of 400m at 12.5kph with breaks of 2 mins at 10.5 but after 6 reps that went down to 1 min of walking at 6.7 kph and 1 min SLOW running (I can do it after all!!) at 8/9kph. Does that sound like a session? Why can I happily trot around 10 miles on 90mins but that last 35mins on the treadmill was difficult in places? I managed to do all the reps but the last couple took all my reserves of determination.