Well, after wondering where I'd get the extra 300 seconds from and struggling a little with run 2 and the walking interval, I finished run 3 today and even managed a bit of extra pace in the last 60 seconds. Seems there was "fuel in the tank" for a little burst of speed after 24 minutes of running... really looking forward to week 7 now and quietly very pleased that Laura called me a "runner" today...
Does anyone else struggle in the first 5-10 minutes of your run to get motivated? I find that's actually the time I can find all sorts of reasons why I couldn't possibly continue. If I ignore myself for a while I find the rest of my run is quite enjoyable...