I’d like to pick up a martial art to help me drop a few pounds. Which is the best one for getting into good, lean shape? —Norman S., San Diego, CA

For a truly rigorous workout, Chris Casamassa, the president of Southern California’s Red Dragon Karate schools (you may also know him as “Scorpion” from the movie Mortal Kombat), proposes Muay Thai, which he calls “the sport of eight limbs.” “Like kickboxing, it incorporates the heavy use of elbow and knee strikes,” he says. “It’s a complete-body workout.”

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