That sounds lovely, Catrin. I watch heart rate too but don't bother with speed. Trail running was my first exercise love, I absolutely love it. I prefer trail shoes for off-road and normal running shoes for on pavement, apart from that I don't really differentiate between the two.

I'm on week 5 of couch to 5k this week, the week that will apparently see me doing a non-stop 20minute run at the weekend! Onwards and upwards