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These two photos couldn't be more different, except that each person has the same stern expression.
Linebackers Trent Murphy and Jackson Jeffcoat are hanging out together in Hermosa Beach, Calif., but they aren't catching waves. In fact, they were doing quite the opposite.
Along with Trent's brother, Connor (see the resemblance?), and Chiefs defensive lineman Tamba Hali, the guys took some time to learn the mixed martial art and even got into full uniform.
I guess smiling is a sign of weakness, but you can imagine they broke out into some laughs after the camera stopped snapping.