Step 1: Juice some ginger
I used a Jack LaLanne power juicer. Before buying the juicer, a jumping jack was simply an annoyance from elementary school physical education. But now, whenever I drink fresh juice from the juicer, I imagine myself preparing to tow 70 boats through the Golden Gate channel or to do a couple thousand push ups. Especially after vegetable juice with a handful of garlic cloves.
You could also use a grater and a sieve to extract the juice, but it would be a marathon effort -- probably the way Jack would actually do it.