The 2014 Ice Bucket Challenge accomplished more than just going viral—it funded scientists' ability to discover the gene most connected to Lou Gehrig's disease. Harnessing virality's ability to accomplish good, the #22PushUpChallenge recently began to raise awareness about PTSD and veterans' mental health. Tragically, 22 veterans commit suicide a day, and the challenge seeks to raise awareness about the struggle and the resources people can use to get help.

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People all over the world are accepting the challenge, including celebrities and members of the Armed Forces. While some have made it more explicitly beefcake-y than others (ahem, Scott Eastwood), it's a crucial cause and a powerful way get the discussion going about mental health. Here are some of the folks who have gotten in on the action so far.

1. Chris Evans

2. Chris Pratt and Anna Faris

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