5 miles easy

I ran 5 mi at 9:12 min/mi pace today. This is a little bit faster than my target of 9:17 and I reached the turnaround with an average pace of 9:10. This is backwards from what I should be doing. I would like to run out or upstream at target pace + 5 seconds and then back or downstream at target pace -5 seconds to simulate running negative splits for my upcoming half marathon. I'll try this tomorrow on my 11 mi run.