power

The massage therapist I saw on Monday also practices martial arts, and he asked me what I thought was the most important thing in martial arts.

"Your mind," I said, which is what we learn at the studio where I practice. 

"The most important physical aspect," he said.

"Okay, your core," I said, recalling all the times my instructors have smacked me in the stomach and told me to tighten my core for better precision or balance or force.

"I think it is power," he said.

Hm. We may attend different sorts of studios.