Share your FAVORITE Youtube workout videos

I've been at this MFP thing for about 8 weeks, and Youtube is also a fantastic resource for teaching me different techniques of exercise to use in the gym (or on my bedroom floor) I've watched videos of lifting, aerobics, yoga, Pilates etc... I'm open to anything!

What's your favorite/most informative/comprehensive Youtube exercise video?

*Besides* this one: http://www.youtube.com/watch?v=o-50GjySwew

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