To Create These Videos You Need To Have Your GoPro Set On WVGA 120 fps, Which Allows You In iMovie To Slow It Down A Lot. The Reason You Want 120 Frames Per Second Is So That You Can Slow Down Clips With Out Seeing Frames Like A Slide Show, But With it, it will be Smooth and Easy To See Whats Going On In Slow Motion.
To Make It Even Slower Get Cineform Studios: http://gopro.com/support/hd-hero2-firmware-update/
Cineform Studios Tutorial: http://www.youtube.com/watch?v=A-Xbtbs0yZc
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SkimBoarding Tricks SloMo Video: http://www.youtube.com/watch?v=XoO8WIs9g7Y&feature=relmfu
Music: The Glitch Mob - Fortune Days
iTunes: http://itunes.apple.com/us/album/drink-the-sea/id367738582
Website: http://www.theglitchmob.com