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    Here's Why Teens Are Uploading Videos Of Themselves Fist-Pumping On Instagram

    It all started with a rapper, Lethal Bizzle.

    Have you seen any Instagram videos of teenagers making faces and fist-pumping to music?

    It's kind of weird.

    But now even soldiers are getting involved in the meme.

    So what's the deal? Why are all these people uploading these videos to Instagram with the hashtag #rariworkit?

    It's all because of U.K. rapper Lethal Bizzle, who sent a Snapchat message to his fans a few days ago, in which he was fist-pumping in his car and overlaid the video with the words "Rari work out".

    Think @LethalBizzle had too much sugar today #rariworkout #leeeavveeeitt

    H£ALTH IS W£ALTH@P_Hollowed

    Think @LethalBizzle had too much sugar today #rariworkout #leeeavveeeitt

    06:58 AM - 14 Apr 14ReplyRetweetFavorite

    He then sent out an Instagram with a similar video message yesterday, which sparked the trend.

    This was the first video on Instagram with the #rariworkout tag after Lethal Bizzle's post.

    And then it just grew...

    ...and grew...

    ...and grew.

    But this one's our favourite.

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