Exercise ideas...

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Hey everyone:) happy new years to all
i was just wonderin do any of you know of a YOUTUBE video that a lot of people were talking about of a 90 day challenge or something of that sort.
There like video's that are free to watch on Youtube and they help you exercise for 90 days

i really want to do try that out but i cant find it.
if any of you know the name i would much apperciate it
thank you all:)