^kettle bell circuits are the best(and by best I mean will make you want to kill yourself) for MMA or really any combat sport oriented workout. If your gym doesn't have kettlebells, dumbbells work too. Also when you make your circuits, make like x number of one exercise, then switch to x number of something that works different muscles, then x number of something that works different muscles, then x number of rest(rest is usually jumping jacks, crunches, etc. trust me, these are life savers). Then keep going through the circuit until five minutes are up, then you have one minute to rest before your next circuit.
Trust me, you will be completely worn out within two circuits if you're doing it right. We usually finish off our MMA class with 5 muscle endurance circuits and 1 cardio circuit.