Warming up is very important before jumping into an intense workout routine.  Doing so helps prevent injury, increases blood flow, and limbers up the body to perform strenuous exercises.  When stretching, warming up the muscles first will prevent any tears or pulls that result in injury as well.  I believe a proper warm up should give your body full range of motion.  The warmup I have today will not only limber up your body, it will prepare you to be a much better fighter.
Each exercise in your warm up is timed.  Exercises which fall on odd numbers (1,3,5,7), will run for thirty seconds, while exercises that fall on even numbers (2,4,6,8) will run for fifteen seconds.  The workout will run a total of five minutes.  Times will be next to each workout to help you.

• Jump Rope – 30 seconds
• Hop / Bounce – 15 seconds
• Run in place – 30 seconds
• X-Burpee – 15 seconds
• Jumping Jacks – 30 seconds
• Squat Thrusts – 15 seconds
• Side Shuffle – 30 seconds
• Tuck Jumps – 15 seconds
• Jump w/ rotation – 30 seconds
• Sprawl – 15 seconds
• Cross Country Skiers – 30 seconds
• Chase the Rabbit – 15 seconds
• Jump Rope – 30 seconds

Warming up is especially important before any rigorous exercise.  Any warm up that not only gets your body ready for fight training, but also pushes your limits is a benefit  to any fighter, inside or outside of the ring.