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The GDGU consists of a deep squat followed by a supine plank with many different variations to make the move more or less challenging. Here are two variations to get you started!
Remember... you shouldn't feel any pain when performing this movement! If coming into the deep squat bothers your knees, you may want to try placing a bench step or other stable prop underneath the BOSU Ball to raise it a little higher off of the ground. You can also try adjusting your stance by bringing your feet a little further apart or try standing either closer to or further from the platform. You can always send me an email if you have questions about form!