Fresh off a world championship win in Thailand, 11-year-old San Luis Obispo native Ava Cano is back in the ring.Cano started taking self-defense classes at a gym in San Luis Obispo at just four years old. After catching a glimpse of Muay Thai training following practice one day, she knew immediately that was what she wanted to do."I would just beg the coach to let me join. And finally, after a couple weeks of begging, he let me," Cano said.Since…