About a dozen military veterans have locked themselves inside a caged boxing ring, in a rough part of San Diego, and they're starting to throw punches. It's therapeutic, they say.
"A lot of people say, 'You guys are punching each other in the face. How is that helpful?'" says Aaron Espinoza, a former Marine. "But it's a respect thing, it's mutual. I have to push him, he has to push me to get better."
Espinoza is a regular at P.O.W., which stands for Pugilistic Offensive Warrior, a mixed martial arts training session that's free for veterans.