Startup world, Y U SUCK AT MOTIVATE?
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Seems like a pretty big flaw in that experiment - being forced to think one way or another is bound to make you feel like crap.
The motivational videos/speeches I linked didn't force anyone into anything. They tell you stuff in an ever more passionate way, so that it scoops you up and makes your passions run high.
It's actually a trick used by a lot of speeches where the aim is to rile up a crowd. King's "I have a dream" speech is very similar in this regard.