Running 37:19 [4] 9.32 km (4:00 / km) +170m 3:40 / km
ahr:167
Supposed to be a 40 minute threshold but plumbing weren't holding up too well so didn't do the last little bit.
Felt really quite easy for the first 5k - @3:50s and hr not above 164
Few hills in the second half the average pace down to 4s but better for the heart rate.
Nice to be at threshold pace and feeling easy like.