GOAL: 6-10 Rounds, about 1:45 per round.
Only use the heavy kettlebell as long as you can maintain good form. If things start to get a bit sketchy, drop to a lighter bell or drop to Russian swings. Make sure you can go overhead without hyper extending your back (usually an issue when someone has tight shoulders).
Try to push the pace on the swings and the box jumps, and then take extra breaks on the dips to catch your breath. Overall, do not come out too fast and blow up! 15 minutes will be longer than you think.