One minute intervals. 4.5mile route from my house through Balloch over the bonhill bridge. Set my watch for one minute alerts (yes, Marco, all by myself) and off I went. Why oh why do all the fast minutes happen to be on hills? Felt really light, even when I started. Thought I might have to crank my legs after Saturday's journey. Finished route in 35.34, which was over a minute faster than last time. Aim is still sub 35 before Christmas. Nice wee route to test times.