I just did a little ride , as I mentioned I live in the hills and I have to go some distance down hill to find flat ground .
I rode 8 km over 30 min on dirt , with 3 x 1 km of climbs ( about 80m over the km .) The HR monitor sat at 150 to 154 climbing .I really think I need to find some flat bitumen if I'm going to enjoy this ,my hills are too long ! The 30 minutes was about all I felt like doing .
Someone to ride with would be good too .