Know when to walk away

Went to the track on thursday with the plan to do 3x(3x200) 1 minute, 15 minute recovery. As soon as I got there I knew I wasn't switched on. Did the first 3 in 27,30,30 and knew it wasn't happening. Started the next set and did another 30 and decided it was sensible to stop as all I was going to do was learn how to run slow. Packed my bag and came home.

Definitely the right thing to do. If your head's not with it then you can't do a decent session.