<human>: I have my first race, a 5k, since 2007 this Sunday. I have been running consistently for about 2.5 months and am at 20 mpw with a long run of a little bit over 5 miles, with one day of 9.5 miles in two runs. Most of my runs have been at easy pace, as I am building my base back up, with a few tempo runs thrown in. My former pr was 17:53, but I did sporadic exercise between '07 and '12. 

Since all my runs are at an easy pace, I'm not quite sure what pace I am capable of doing, so I am thinking about doing this workout

* **3x800s at my "goal" 5k pace (22mins) with a recovery lap between each one.**  

I am not running this really as a track workout. Like I said, it is more to determine if a 22min 5k is doable for me. Does this make sense? Or would there be a better way to determine what is reasonable to go out in?

Can you give me a shortened version of the text?
<bot>: Would 3x800s at 5k pace with a lap jog in between be a good workout to determine what pace to go out in for my first 5k in years this Sunday?