3 hills challenge

I got along to the club session last night.  It was an interesting session that I haven't done before, called "3 hills challenge".

Basically, there are 3 hills that all start/end at the same point.  The session is to a) run hard down the first hill and jog recover up b) run hard up the second hill and jog recover down and c) run hard up the third hill (which is the steepest hill) and jog recover down.  Repeat this for 45mins.  A tough little session and my Garmin trace does look strange for this one.