I download Crossfit workouts and stuff from YouTube using this
http://www.clipconverter.cc
Free, easy and gives you options to save from small, to HD.
> Paste URL from YouTube
> Conversion Format: I convert to AVI
> Above Conversion Format, to the right of URL , press continue.
> When detection done, hit "Start"
(Its will now record and convert)
> When done, press Download. (Sometimes an annoying pop-up will come up/ close and hit download again)
> Now a screen at the bottom will come up with save, I just hit 'save as' to desktop and done.
Whole thing takes 2-3 min a video and you can do this to monster 1hr videos on YouTube even.