Thermodynamics: When its colder I go faster...

20:04 for 5km and all before breakfast

It was -7C today.  I got a PB.  Last time I did that it was -4C.  My engineering training tells me that, thermodynamically things are often more efficient at lower temperatures but not necessarily faster - hmmm

Update 11th February

-7C again.  Ran without looking at my time...


Split    4/02     11/02

1        3.15     3.14
2        9.37     9.38
3       15.32    15.31
F       20.04    20.04

Consistent at least!

Update 18th February

It was 15 degrees warmer than last week and I was 28 seconds slower...

Not helped by a bloke running the same speed but making an awful noise - like he was in massive pain and about to expire - slowed me down.