I've been doing it for about 16 months, ever since I got my Ninja Blender, and I don't think I've missed more than 3 days without drinking a green smoothie.
I'd suggest using frozen bag vegetables. From what I've read, the nutrients are flash frozen and they keep that way from the grocery store freezer case and in your own freezer at home. Buying fresh is actually not the best.
I use Kale, Spinach and Broccoli with some bananas to neutralize the taste.
BTW, after being into weightlifting for years I can honestly say I've never seen muscle gains like what I've had since taking in lots of greens. I'm in better shape than I was at 20.
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