Lauren Villagran: Teenage boys shuffle into a cramped room. Wearing the same navy blue sweatpants and white undershirts, they sit cross-legged on yoga mats laid out on the floor. Thick scars on forearms and biceps are apparent as they stretch their hands to their knees and shut their eyes.

Yoga instructor – and ex-convict – Fredy Díaz Arista begins guiding a meditation aimed at relaxing the group of 10 young offenders. Among them and their peers, about 300 youth in this Mexico City jail, the crimes range from drug abuse to robbery, assault, and murder.

“How long can you stand yourselves with your…

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