A negative split great rest run

My wakeup HR was 46 and I felt good. The temperature was in the low 50s (F) when I left, and it was a beautiful day for running. I ran my hour rest run and enjoyed it. The return half was about 2 1/2 minutes faster than the first half, and I ran an additional ~1/5 mile to finish the time. I felt strong during the run. I ate a banana just before I left, and that might have helped a bit.