-High rep squats (1x20, drop sets/strip sets, rest pause, etc)
-Front carry medleys for 50' (usually 2 implements, sometimes 3)
-15 minute non-stop circuits (classic is KB swing for 10, chin for 5, dip for 5)
-Interval training (stolen straight from Dan John, use the tabata timing of 20 seconds work, 10 seconds rest for 4 minutes. I've done this with safety squat bar squats, slam ball slams, and log/barbell clean and press, and burpees all with amazing and terrible results)
-10 minutes of every minute on the minute movement (I've done this with 3 sandbag clean and presses along with 3 log cleans each minute. I've had my wife do it with 3-4 burpees as well, both are great at making life suck)
-100 burpee challenge (try to get it done in under 10 minutes)
-Sled drags (don't run with the sled, just drag it)
Really, the only wrong way to condition is to not do it.