Assuming you've grounded yourself with the basics, I'd start with Providence.
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The Grim Reaper catches us all. But when he catches me the son-of-a-bitch is going to be hunched over, wheezing and gasping for breath!
I just got the Providence DVD and I LOVE it!! I was so initimated by it that I used lighter kettlebells the first time. I'll definitely be going heavy the next time around. Great full body workout and it moves very quickly. You'll love it!