Groups of teens are targeting innocent bystanders in what’s being called "the knockout game." They try to knock people out with one punch. Some of the attacks have turned deadly.
Raising America host Kyra Phillips rolls up her sleeves and throws down with MMA fighter and trainer Rodrigo Artilheiro to show you how to defend yourself from a random attack.
Tweet your reactions to @KyraHLN with the #RaisingAmerica hashtag or leave your thoughts on Facebook.com. And for more conversations like this, watch Raising America every week day at 12 p.m. and 4 p.m. ET on HLN.