Do you want to burn some serious calories? Then try a boxing or kickboxing workout! It's suggested that 30 minutes of sparring drills can burn anywhere from 400 to 1000 calories! That's SERIOUS!
Make certain that you choose a good instructor who has experience as a trainer, in these areas. Also, make certain that you're properly warmed-up, prior to engaging in this type of workout, as you'll be working many muscles through ballistic movements (maximum acceleration and velocity during muscular contractions, over a very short, time span.)
In addition, you will oftentimes develop coordination and memory, as you "work the bags" with different punch and kick, combinations. Hey, you may also learn some self-defense scenarios, as well!
So when you're working your 1-2-3's, highs-lows-highs, bobbing and weaving with blocks and counters, remember: You are burning some serious calories!