Off the record, I would suspect some kind of martial arts training.

"How do you know I've had any martial arts training?"

And the few who are have not the martial training to carry off such a deception.

"A little martial arts training when you were a kid, huh?"

Once you get to a certain level in martial arts training, the physical effort sort of peaks out and technique takes over.

His martial arts training started with Taekwondo at the age of 6.

Her martial arts training might be a bit rusty, but she could defend herself well enough if it came to that.

I was slim and toned from the martial arts training.

Narcissus found out that martial arts training doesn't stand up to true warriors.