I think the endorphins must have kicked in after the second 3 minute run. I started smiling and then laughed out loud a couple of times. No-one was around, thank goodness, but I just felt very happy all of a sudden.
The final 5 minute run was 'enhanced' by the grin on my face and when Laura told me to slow down I shouted Yes! very loudly and just told myself how proud I am.
I even sang along with some of the cool down song.