We do circuit drills here and it's been really awesome. Set up 4 or so stations and get through them as fast as you can.
Stations can be anything from battle ropes, pull ups, situps, burpies, jump split squats, dips, shuttle sprints, etc. Set them up to get a full body workout and go through all stations 4 or more times. If you do it quick enough, it will also help cardio, but you could go on a short 2 mile run after.
It's crossfit stuff and these guys love it. They're some of the most fit people in the military conducting our PT