I normally prefer running outside but today decided to repeat W5R3 on the treadmill as I was pushed for time. My running route takes about 20 minutes to walk home after the 20 minute run.
I did my 5 minute warm up walk at 4 mph then 21 minutes at 5.9 mph which feels a comfortable pace. I felt that I could have done more but didn't want to over do it as it. When running outside it is easier to tell when I have done enough but have done too much on the treadmill before now.
I am beginning to really enjoy the running again but not sure my heart rate should be as high as that at 60.
I find it very difficult to run at a slower pace on the treadmill as I am constantly fighting to keep a steady speed and either get to close to the front or rear of the belt. At the pace I set, I easily stay in the same spot on the belt.