The former boxing champ uses her brain injury to call for systemic changes to improve the health and education of fighters.

Chimaev, much less the UFC's annual Las Vegas summer festivities. Khamzat Chimaev (red gloves) fights Kevin Holland (blue gloves) during UFC 279 at T-Mobile Arena. / Joe Camporeale-Imagn Images ...

But all in all, I go with the dominant Kayla Harrison." Ailin Perez (red gloves) celebrates defeating Joselyne Edwards (blue gloves) during UFC 302 at Prudential Center. / Joe Camporeale-Imagn ...

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