can someone explain the 100 push up challenge

i can't find an original post on it and i was wondering what it is all about. i really need to strengthen and tone my arms but sadly i can only do 10 push ups in a row and that was a struggling to get that last one in. i'm just curious cuz i see people posting about it with numbers but i don't know what it all means, i also saw an old post about a 100 crunch challenge. is anyone still doing both of these things?

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