Hills, walls and flying

Out running before 7am. The weather was gorgeous and I was hoping to run 3 miles. Thanks to the podcast by 5k101 Running Mate I managed my 3 x 12 minute intervals. Whilst I was running I noticed there were periods where I hit walls. It took some mental conversations to just jog to the next obstacle. However even though there are plenty of hills on my route, there were periods where the running felt easy (almost like flying) and where I felt I could continue running for miles. 

Can you tell I really enjoyed my run this morning?  How was your run today?