What Sport Is Right For Me: Kickboxing or Trampoline Gymnastics?

In January I want to sign up for a recreational sport. I want to do a sport, where I can gain muscles and a good workout. I haven't done recreational kickboxing before but it looks fun. With kickboxing I thought you just do cardio/aerobic workouts and gain muscle. I want to gain muscle more than loose calories. I have done trampoline before, i got a flat stomach. But I want to loose fat and gain muscles in my arms, legs and chest. What sport can I do that in?