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A few questions for already experienced Fitness Blenders

Hi everyone I wanna star a few Fb programs, but before that I wanted to ask a few questions.Since I've already read that I need internet access in order to workout I was wondering whether the videos open on YouTube or a different kind of an app or anything. Will I be able to watch them with low quality mobile internet service and on my phone since that is all I have in my dorm room..Also just curious, are the programs a combination of various videos that we already workout with for free on YouTube or are they completely new? Thank you ^_^