In class last night, we did this circuit 4 times, and then moved on to more total body exercises. 4 rounds took about 25 minutes, and everyone was really sweating by the end. Try it at home if you don't have a treadmill by replacing the 3 minute jog/sprint with 1 minutes of burpees or mountain climbers. Use a heavy weight. 15 reps of bicep curls isn't a lot, so you should be really burning by the end.
4 rounds (or as many as you can)
3 minute jog/sprint
1 min high plank, tapping shoulders with opposite hand