I wonder if the 350Hz metal Powerball is much heavier to run coimpared to the
250Hz type. I read it is told to be 2 times heavier , but does that mean while running or when its not in "action" ? I also wonder when and where i can get this one. I havent seen any of this type in any stopre that sells the powerballs. They still mainly sells the 250Hx with and without the counter.
I mainly use the powerball for upperarm feats, even if its fun to try to use it for racing. A heavier powerball would be nice to have lower external rotational speeds for same resistance, to be able as the bodybuilders say "gain contact" with your muscles.
I might use wrong technique for getting those almost fantastic results at 15k-16k. I mainly use my wrists to rev up the Powerball all between 13k to 14k just by wrist rotation, this since I use ot to maintain strength and warm up for gripping and armwrestling.