Need to work harder

Hill sprints for the first time in a good few weeks. The weather was being unpleasant but only in so far as it was raining, but no howling gales which was a relieve. I was able to find a nice quiet spot up footpath that sort finished in a muddy trail. The sprints themselves went well and I wasn't collapsing halfway through feeling as if I was going to see my breakfast again. It was then that this nasty thought struck me had I pushed myself hard enough? Deep down I know I didn't which is a little discomforting. Maybe I've subconciously got an eye on the back to back steady runs I have lined up in the next 2 days.