I love using is as a warm up for playing drumset. I'm seeing that the bad reviews are mainly written by people who can't figure out how to start the dang thing.. One method for starting the dynaflex is to quickly run it down your pant leg to rev it up and then get it going up to speed with wrist motion. If that's too hard, try rubbing it quickly across a carpet. You should experiment with the angle at which you hold the device.. I had an easier time in the beginning if I held it horizontally instead of vertically to get it going.
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