Did run 3 of week 5 on the treadmill at the gym and despite my left calf aching during the first five minutes of the twenty minute run i did not stop and probably could have gone on longer. A few weeks ago I wouldnt have dreamt that I could run for 20 minutes without stopping.
Only problem I have is timing the treadmill in with laura so her five minute cool down coincides with the 5 minute cool down on the treadmill. May ditch laura after week 6 for my own music although will miss her telling me I am halfway through.