"A sport that I like is kickboxing. This sport was invented in Japan, but it's practiced all over the world. It combines both boxing and karate kicking techniques. Kickboxing unlike Muay Thai, doesn't allow elbow or knee strikes. The American version/variant that I practice doesn't allow low kicks either, so you can only kick above the waist. Kickboxing is excellent for losing weight, getting fit, increasing speed and stamina. Furthermore it's good for self-defense".

Hey Miguel, I recommend you also writing your paragraph in English, which will be really helpful to understand. Your Chinese is good, but there are still some sentences ambiguous and they confused the reader.