As with any partner workout, it's in your best interest to switch out before form or intensity is compromised. You've essentially got 30 minutes to work so dying in the first 5 because you wanted to go out hot will help you . . . not at all. So focus on technique today because you've got a crap ton of chances to do so. And enjoy this workout with those good lookin partners. Give em plenty of high fives they deserve it.