A device much like a stairmaster, but instead of two steps on the machine their are two gong mallets on the machine. Used by percussionists of all shapes and sizes to strengthen the forearms, biceps, triceps, while simletaneously practicing some good old fashioned gong motions.
Example of a Gongmaster (tm) Commercial:
Groupie: "Wow Jon the famous Drummer you look so toned and ripped, and your rhythm is so good- how do you do it?"
Kenny the not so famous drummer: "I'm not Jon the famous Dummer, I just use the Gongmaster and it makes me look attractive like him so I get all the girls to admire me. And its only 19.99!" (winks at camera) *wink*