Hi There.
I am not sure of keets, only chickens, and i should imagine they are just as fast.
You also have 15 of them to catch, they could run off in diffrent directions. Plus they will
get stressed, with you chasing them. The other thing you could do, if you want them to
have exercise, is buy one of these. lol I bought ours, just to introduce new chickens
to flock, as they can see each other, and they get use to them. It comes in handy for
a lot of things. I have copied it for you to see. They are not expensive, and you will
find them on
Amazon, or anywhere if you google it. The panels slot together, it is
a bit flimsy, but we used tie cables to secure the panels together.We also used tent pegs, to secure it to the ground. It is a good size too and you get the sunshade with it. At least you know they will be safe, until your coop is done. Hope this helps and good luck.
Bunny Business 8-Panel Playpen with Free Safety Net, 55 x 55-inch, Extra Large